Is there some rule against ending a sentence with the contraction “it's”?
In conversing with non-native English speakers online, I saw someone type:
Do you know who *I’m ?
This is obviously wrong to a native English speaker, but I don’t know why. Is there a rule that tells when contractions are not allowed?
Here are some more similar examples where the contraction doesn’t work (with the expansion of the contraction in parentheses following each):
Can you tell who *I’m by my voice alone? (I am)
Please, tell me who *he’s/she’s/they’re. (he is/she is/they are)
If you want to go to the movie, *we’ll. (we will)
Will you have some? Yes, *I’ll. (I will)
I won’t have any, but tell me if *you’ll. (you will)
I didn’t have the same thing for supper as *you’d. (you had)
Would you like to go? Sure *I’d. (I would)