Определите в предложениях видовременные формы глаголов и укажите их инфинитив:
1. Cars exhausts pollute the atmosphere
2. What did his last experiment lead to?
3. When will you graduate from the University?
4. Appoximately 350 millon people speak English as their native language
5. I know that she was teaching chemistry last year
6. He has recently written a scientific paper

1. Cars exhausts pollute (pres simp - to pollute) the atmosphere. 2. What did his last experiment lead to? (past simp - to  lead ). 3. When will you graduate from the University? (future simp - to graduate) 4. Appoximately 350 millon people speak English as their native language (pres simp - to speak) 5. I know (pres simp - to know) that she was teaching (past cont - to teach) chemistry last year 6. He has recently written a scientific paper (pres perf - to write)