Questions 6:
1. This video film is so interesting although I have seen it twice.
2. It is difficult to learn English without (having) a good dictionary.
3. He has been learning English for 2 years now.
4. She used to stay with her uncle when she was a child

1. different than -> different from
2. have -> had
3. for -> since
4. many -> much

1This video film is so interesting that I have seen it twice.
2 It is difficult to learn English without a good dictionary.
3He has been learning English for 2 years now.