An auxiliary verb modifies the main verb to give more information about the main verb.

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“Would rather [infinitive1] than [infinitive2]” vs. “would rather that [subjunctive]”"

I am aware of sentences like Beth would rather study at the library than go to parties. There is another type of using rather that: She would rather that the plane leave early in the ...
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“Why couldn't” vs. “why couldn't you have”

Reading Harry Potter 2, I came across the following, and I wonder if the use of couldn't have is the equivalent of couldn't in this context? "I have got a question, Oliver," said George, who had ...
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“How dare you” vs “How do you dare”

I know that dare is a semi-modal verb. I just don't know when to use it like a modal auxiliary verb and when to use it like a normal verb. Given the following examples: How dare you ... How do ...
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Why do we use the word “Do” when connecting a sentence? [duplicate]

Possible Duplicate: Sentences using: [something] + have + they Use of “do” in affirmative statements I was reading a news paper article of Times Of India, and came across a sentence- ...
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Using 'would' to form reasons

In the following examples: Why would anyone want to eat something so horrible? Who would live for forever? Why would I ever lie to you? Is 'would' being used to refer to time in future or past Or ...
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Question about “how many”

Why don't we use the auxiliary do in the following question: How many people study there?
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Do I need “have” here?

Was it specifically mentioned as part of their teaching or they have just happened not to have killed anyone? Do I need have there?
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Which mood is created with “everyone should visit”?

Which mood is created with the sentence, "Everyone should visit..." with the use of the auxiliary verb? I have decided already that it is not the imperative mood.
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“I'm not X, am I?” vs. “I'm not X, do I?” [closed]

Which of the following is correct or better? Can they both be used? I'm not making any sense, am I? I'm not making any sense, do I?
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What’s the difference between “come recommended” and “be recommended”?

… But their main business is in parts and refurbishing, and the old man, Deforges, doesn’t like to sell a used piano to someone who hasn’t come recommended. He says it’s more trouble than it’s ...
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Difference between “does have” and “has” [duplicate]

Possible Duplicate: “did shoot” vs “shot” 'Did see' and 'Saw' “I understand you” vs “I do understand you” What is the difference in meaning between “I play” and “I ...
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Why would he do this to me?

Do the following two statements convey the same meaning? Why would he do this to me? Why did he do this to me? To me both of them seem to imply something in simple past.
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“Might have” vs “could have”

What is the difference between might have and could have? He might have come. He might have studied. He could have come. He could have studied. How would you describe a possibility? For ...
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Why are present participle and infinitive equally acceptable for some verbs, but not others

This question about "started teaching/to teach" made me realise that even though the present participle and infinitive are both acceptable after "started", that's not the case with other superficially ...
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Repeating “to” and “will” in enumerations of verbs

Should I use the second "will" in constructions like this one: "it will definitely help you and will make the text more readable" And should I write "to" before every infinitive in enumeration, or ...
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2answers
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Choosing Past Simple or Past Perfect: Do I need “had” here?

Do I need "had" here? If yes, do I need to change "did" to "done"? A: Lucy accidentally broke her mum’s favorite cup yesterday. B: Oh! I think her mom was really angry at her, right? A: ...
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Don't remember vs. can't remember

Could you tell me which is proper in English: I don't remember. I can't remember. And if both are possible and good English, what is the difference?
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Usage of “do” in “why do I want to do something”

Phrase: Maybe you'll ask why do I want to lift my keyboard off my desk. Question: Microsoft Word says that I should remove the "do". Why is that? I think the "do" should stay there.
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Differences between Verb + to be + adjectives and Verb + adjective

If you have a more illustrative title, feel free to change it. I searched but I couldn't find one. This may be an easy and trivial question; if so, I am sorry. What are the differences between ...
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How do “need” and “not” mix and match?

You don't need to play You need to not play You need not play You needn't play You need not to play What does each of these mean, and which ones are equivalent to the others? Is the meaning of the ...
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Subject + “have had” + bare infinitive … ever correct?

In writing an email today I came up with the following sentence: "We have had two other ladies express an interest in the room." I'm a native English-English speaker and this felt fine to me. My ...
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0answers
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“My love don't cost a thing” [duplicate]

Possible Duplicate: The grammaticality of “that don't impress me much” In the Jennifer Lopez song "My Love Don't Cost a Thing" she says: My love don't cost a thing ...
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Is “must” ever grammatical as a past tense verb?

I have seen uses of must that appear to be in the simple past tense. Sometimes these seem grammatical, but sometimes not. Examples that help illustrate my confusion: He knew he must go to New York ...
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“Haven't you got X ?” or “Don't you have X ?”

In British English negative questions with the verb have (when it's a lexical verb and not an auxiliary) can be formed in two ways. Is there any difference between them? Type 1 Haven't I got your ...
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Is it considered proper English to say “You best be…” or “You'd best…”?

Often, I hear people say something like this: You best be going. Or: You'd best sweep the floor before you leave. Essentially, you'd best/you best be just means you should. Is it ...
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Is “of” instead of “have” correct?

I have noticed a lot of people use of instead of have, for example: "that must of been really annoying". Is this correct?
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Is “am going” a verb phrase?

What part of a sentence is the phrase "am going", as in "I am going to pray"?
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In reply to “Do they have…”, which is correct — “yes, they do” or “yes, they have”?

My daughter is in an 5th grade English class in Germany with a teacher who teaches British English. The teacher asked what is the correct response to Do they have some? My daughter, who has ...
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“She is gone” versus “she has gone”

When should I say "She is gone", and when should I say "She has gone" (and why)? I think that when I mean "She went away and she's still there", it should be "She has gone". Are there exceptions ...
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“I am gonna have to” vs. “I have to”

What is the difference between "I am gonna have to" and "I have to"? When would you use the first one? update: I am specifically asking about situations like the one described here.
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Wh-questions: auxiliary verbs or not?

What's the difference between these two questions: Why they chose football? and Why did they choose football?
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“These will be, should be” [closed]

Is the following sentence correct? "... the goods will arrive later. These will be, should be packed, will be stored in our third shed" I don't know if it does make sense to you guys, but since ...
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“I need it to lift 2 tons this time.” “I don't know if it *could* do.” Why do some people use “do” like this?

Sometimes, instead of saying "could/can" or "would/will" (the two most common I've heard), some people say "could/can do" or "would/will do". Instead of: I don't know if it can. I sometimes ...
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Does “will” and other auxiliary verbs spread on all the sentence?

Consider the following example — I want to write down several sequential actions in future. Should I write: I will go home, will have dinner, will play tennis, etc. or: I will go home, have ...
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Seconds has/have passed

Which is proper? The method will be fired after the specified duration of seconds has passed. OR The method will be fired after the specified duration of seconds have passed.
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“Were gone” vs. “had gone” [closed]

Whats the difference between: She were gone to party. She had gone to party. Are they both ok?
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2answers
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“Who wrote … ?” or “Who did write … ?” [duplicate]

Possible Duplicate: Why is there no form of “do” in questions of the type “who knows?” I want to know which is the correct way to ask this question: Who wrote ...
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Usage of “is” and “does”

Which sentence is correct? The directory is not exist OR The directory does not exist This message informs a user about a folder he or she is trying to access.
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What's the difference between be verbs and auxiliary verbs?

I assume all be verbs are auxiliary verbs; is this correct?
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Do I have to use the auxiliary before all the verbs?

Which of the following is correct? I will dance and sing at the concert tonight. I will dance and will sing at the concert tonight. Does it happen with to, too? For example: I ...
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needn't = don't need to?

Are these two sentences equivalent? You needn't pay at once. You don't need to pay at once. If yes, which one would you recommend? Is it an US/GB thing?
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Is “am” in “I am right” an auxiliary verb?

Consider these sentences: The ice was thick enough to walk on. They were in a hurry. There is enough salt in it. It is freezing. I am right. Are the italicized verbs ...
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“All your commas are belong to Array” and similar — is this grammar form “proper”?

I've often come across "weird" sentences like, say, instead of: All of your commas belong to Array. It writes: All your commas are belong to Array. It's not just once or twice, I actually ...
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6answers
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Should there be a “were” instead in “till there was you”?

Rachael Starr has a song titled "Till there was you". Shouldn't it be "Till there were you"? Why did she use it that way?
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“How can X be” vs. “how does X can be”

I have a Spanish friend, who wrote the following sentence: "How does foo, bar, baz can be compared?" I corrected it to read: "How can foo, bar, baz be compared?" Other than the obvious, he ...
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Is “is” an auxiliary verb? [duplicate]

Possible Duplicate: Is "is" an auxiliary verb? My Mum's bag is blue. Is is an auxillary verb in that sentence? If not, what part of speech is it?
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2answers
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Is “is” an auxiliary verb?

John is working now. Is the verb 'is' in this example an auxiliary verb?
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Correct usage of the verb “do”

Is it correct to use the word "do" twice in a row? For instance; "I do do that" or would you say "I do that"? "You do do that" or "You do that"? Which is correct, or are they both correct?
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Auxiliary verb and adverb ordering

(I'm not really sure if the title is a correct definition of my problem at all) I'm not a native English speaker, and I'm used to say: Spaghetti suddenly can talk But I've seen a phrase from a ...
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“Have not” versus “do not have”

As a non-native English speaker, I have a little doubt about using, or not, the auxiliary verb "to do" with the verb "to have". Are there differences in meaning between "I have not" and "I do not ...