Which sentence is grammatically correct?
- I don't know why did I write it
- I don't know why I did write it
Which sentence is grammatically correct?
- I don't know why did I write it
- I don't know why I did write it
the first one is incorrect, but the latter is true, but WHY?
one of the usages of "do", as an auxiliary verb, is to emphasize what we are saying, for example:
He does look tired. (He looks tired)
He did at least write to say thank to you. (He at least wrote to say thank to you)