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I am trying to remember whether the sentences below are correct:

  1. I don't know this guy being able to complete this task.
  2. I don't know this guy can complete this task.

I think the first one is correct. (I know they don't mean much but I am asking in grammatical manner.)

I am also trying to remember how to reduce the "who" within the following sentences:

  1. I don't know this guy who has been doing this all along.
  2. I don't know this guy who has done this all along.
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3 Answers 3

up vote 2 down vote accepted

Neither of the first two is correct. It should be

I don't know if (or whether) this guy can complete this task.

"this guy can complete this task" needs a subordinating conjunction to be added onto the sentence "I don't know" as a dependent (or subordinate) clause.

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Lets say if I say This man who can do a lot of things is my friend. In this sentence, how would you reduce the can? –  MoonLight Aug 25 '11 at 13:56

Regarding OP's first question, @mmyers's answer is accurate and complete.

Re the second question (which should have been asked separately), trying to remove "who" is probably both awkward and pointless. Better to remove the clumsy duplication of "this".

Almost certainly the context doesn't include the speaker actually indicating "this guy" (as opposed to any other guy who happens to be around, and quite possibly the actual one being spoken of isn't even present). That first "this" is an informal / slangy substitute for "the", which jars when the second "this" really is something in the "here and now" which is being spoken of. Change it to "the".

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The answer was given for the first questions..

But for the second you cant reduce it like that. Reduction is not using relative pronoun only using the verb..

There is a man who is sitting on the bank in the garden. There is a man sitting on the bank in the garden.

If you use who in the meaning of whom you can omit it..

The students who(m) the teacher got angry with were innocent. The students the teacher got angry with were innocent.

As you see you can not change the tense in your pair there is no reduction.. If required I can tell the other reductions about this

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Please keep continue telling me the other ones especially the ones such as can, be able to, should etc. how I am gonna use them if there is a reduction. –  MoonLight Aug 25 '11 at 13:54
    
Actually I asked my question incorrectly in my original question. What I was trying to ask is such a sentence and reduction of the who : There is a man who can win this trophy, I saw a person who is able to do all the works here, I know a person who could handle all these stuff etc. –  MoonLight Aug 25 '11 at 14:00

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