1. have been
2. have visited
3. have found
4. has improved/left
5. bought/haven't worn
6. haven't seen/left

1. the letter was read many times by her last night
2. I wasn't introduced to her mother
3. these flowers are watered by my father every afternoon
4. that house was built in 1972
5. we have been taught French by Mr Smith for 2 years

I.
1. was
2. have visit
3. found
4. has improved/ left
5. bought/ haven't worn
6 haven't seen/ left
II.
1. The lettters was read many times (by she) last night.
2. I weren't introduced to her mother (by she).
3. These flowers are watered by my father every afternoon.
4. That house was built in 1972.
5. We have been taught French by Mr.Smith for two years.
III.
1. Although she felt sick, she went to school.
2. Although he is very rich, he isn't happy.
3. Despite not answering the questions, she is very intelligent.
4. In spite of trying a lot, he was not successful.
5. Despite his hard life, he determined to study well.

1. although she felt sick, she went to work
2. although he is very rich, he isn't happy
3. despite being very intelligent, she couldn't answer the question
4. in spite of trying a lot, he was not successful
5. despite his hard life, he determined to study well

Sửa lại I câu 1 là were nhé bạn ^^

thì QKĐ ă