reason
First, there in no grammer mistake in either sentence, except for the question mark at the end. That explaines why you have a green line under the sentence in word(green line means the format is not correct, not word bug!). Also don't believe word can do the grammer checking for you, spelling check is the minimum.
Trust this answers your question. And I agree with Triniton, the sentense sounds better if you use -ing, which is,
How many Chinese are living in Ottawa now?
Good luck!

First, there in no grammer mistake in either sentence, except for the question mark at the end. That explaines why you have a green line under the sentence in word(green line means the format is not correct, not word bug!). Also don't believe word can do the grammer checking for you, spelling check is the minimum.
Trust this answers your question. And I agree with Triniton, the sentense sounds better if you use -ing, which is,
How many Chinese are living in Ottawa now?
Good luck!
