1. Before she had watched TV, she had done her homework.

=> Had watched thành watched

2. Tom was seeing an accident while he was standing at the bus stop.

=> Was seeing thành saw

3. I read this novel several times.

=> Read thành have read

4. My mother sometimes buy vegetables at this market.

=> Buy thành buys

 Thanks nhieu

CHữa lỗi sai:

1. Juha's wife cooked the meal , and waited for long . So->but he didn't come back..................................

2. Because->Although she worked hard , she had nowhere to live...............................

3. While->When I came , her grandmother was telling her a story................................

4. You mustn't to tell->tell everyone what I just told you.....................................

while -> because

Ex 2 : Sửa lỗi sai trong các câu sau

1 . I was play-> playing football when she called me .

2 . Was->Did you study Math at 5 p.m yasterday ?

3 . What was she do->doing while her mother was making lunch ?

4. Where did you went->go last Sunday ?

5 . They weren't sleep->sleeping during the meeting last Monday

homeword => homework 

Mary never went =>had never gone to bed before she has => x finished her homework 

Before + QKĐ, QKHT

tìm lỗi sai và sửa :I havent come back to london for => since  my father last visited me

Tìm lỗi sai và sửa

1/ While her mother arrived home, it was raining heavily

While➜When

2/ the accident was happening when it got dark

was happening➜happened

3/ my brother was playing football since he broke his arm

since➜when

1.arrived -> arriving

2.was happening-> happened

3.was playing -> hasn't played

1 often is => is often

2 go => went

3 works => is working

4 drink => drinks

5 don't => not to

6 reading => is reading

7 happy => happily

8 sad => be sad

9 are => to be

10 speaks => speak

cho mk hỏi là câu 10 sao speak lại bỏ s mk nghĩ Nick là số ít thì phải chia V chứ