You're on the right track! If an interrogative word (how, who) is the subject or a part of the subject, do, does, did isn't used. But: How many friends did y ou invite to your party?
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Cool Breeze But: How many friends did you invite to your party?
CB
Why is that so in this case?
And what about "Who did you see?" Instead of "Who saw you?"
NewguestWhy is that so in this case?As I said, the interrogative word has to be the subject for do to be omitted. If some other word is the subject, do is used.