1.When she arrived,she saw them were talking loudly.were 多余
2.While I got home,my mother was cooking supper.While 改为 when
3.Do you remember what were you doing at that time?were you改为you were
4.Have you already finished learning Unit 9 already改为yet
5.She wad badly ill since last Friday.was改为 has been
6.The Greens have ever come to China twice.twice前加for
7.My father has been to ChangSha.He'll return tomorrow.been 改为gone
8.When have you buy this bicycle?have改为did
9.We have studied in this school since two years.since改为 for
10.Have you ever saw a robot saw改为seen
11.He said if it is rainy ,he won't come .said改为says
12.Mr Hu said he isn't mad at me anymore.said改为says
13.He asked there would be less pollutionin the future.asked后加whether / if
14.Will there have a class meeting next Friday?have改为be
15.Did he ask you watched TV last night?watched改为to watch