1．(2019·山东潍坊一中月考)My sister met him at the Grand Theatre yesterday afternoon, so he couldn't have attended ( attend) your lecture.
2．—Jenny, I have washed the clothes for you.
—Thanks.You need not have done it.I could manage it myself.
3．—Did Mary come to the party?
—I don't know.She may have come (come) while I was out.
4．There was a lot of fun at yesterday's party. You should have come, but why didn't you?
5．(2019·临川一中期末)What a pity! Considering his ability and experience, he could have done (do) better.
