Dùng đúng ngữ pháp trong câu:
1, i never (be) able to finish this composition because i (lose) my pen
2, Please show me the painting when you (see) him tomorrow
3, Somebody (smoke) all my cigarettes. The packet is empty
4, He discovery to his horror that he (eat) the fly
1. will never be/have lost
2. see
3. smokes
4. is eating