-5
votes
1answer
164 views

Grammar: did + past simple, is it correct? [closed]

I’ve noticed a few times where someone says something like “Did you made...” or “Did you worked...” when asking questions. Is this some kind of unofficial talk or is it completely incorrect ...
3
votes
2answers
2k views

“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 ...
21
votes
7answers
11k views

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 ...