帮你出几题:
1.I am reading a book now.
2.He takes off his hat.
3.I will visit my friend tomorrow.
4.She had done her homework.
5.She went to shopping yesterday.
6.They will go to the zoo next Monday.
7.We had finished the projects.
8.You have been very nice to your friends.
9.Tom is going to see a movie with Jenny.
10.Betty has been cooking since 2 o'clock in the afternoon.
11.I saw a little bee flying around the red flower.
12.Johnny was playing football yesterday.
13.Bobby watches TV everyday.
14.Billy has been cheating his mother.
15.Darcy will be the winner in the game.