If you often go to a gallery, it ______ well change forever the way you look at art.

--- May I go now? --- No. You ______________ let the teacher know first.”

The lady ________ have done something wrong, because she is looking guilty.

 Surely Mr. Peterson ____ have forgotten to buy presents for his beloved family members. After all, it was Christmas!

 Jack _______ swim when he was five years old.