“You can say, ‘a circle is rectangular in shape,’ and all you’ve done is confused us!”
- Should it be all you’ve done is confused us?
- Or should it be all you’ve done is confuse us?
I don’t know what rule governs this situation. But my upbringing (thank you to my mother, Leona Anne, of Ashland, Ohio) suggests a rule something like this:
After a phrase like all you’ve done is — you switch to the present tense: confuse us!
But why? I don’t know. Maybe the phrase all you’ve done is actually stands in, as a substitute, for an implied longer phrase: all you’ve done is, you’ve… In which case, you need a past-tense verb: you’ve confused us!
Somebody help me out here. Use the comment box and enlighten all of us, please.