1. Tim (see) saw a serious accident while he (stand) was standing at the bus stop.
2. Mr Ba (teach) has taught English in this school since he (graduate) graduated from the university in 1986.
3. I remembered (post) posting to you two weeks ago
4. He (not realize) didn't realize that the traffic lights (be) was red. He didn't stop.
5. Rice plants (grow) will grow well if there is enough rain
6. Unless Tuan (take) takes his library book back tomorrow, he has to pay a fine.
7. He must (do) do his homework if he (want) wants to go out
8. I could understand the French teacher if she (speak) spoke more slowly