英语问题！！！急！！！很简单的！！！

来源：百度知道 编辑：UC知道 时间：2024/06/30 18:27:37
1 By the end of next term,we ____(finish) three books.
2 When the policeman arrived ,the robber ___(disappear) downstairs.
3 How long ___ Tom ___(study) Chinese before he came to China.
谢谢大家了~~很急~~~谢谢~~~
还有一个漏掉了
I didn't see him .but i ___(hear)him ___(go) downstairs.
谢谢了~~

1 By the end of next term,we _will have finished__(finish) three books.
By the end of next term，说明书未完成．本句的意思是：写完下一章，我们写完3本书了．
所以我认为用将来完成时．

2 When the policeman arrived ,the robber _disappeared
__(disappear) downstairs.

过去时即可．

3 How long _had__ Tom _studied __(study) Chinese before he came to China
因为后半句的是用come 的过去时，故前面用过去完成时had studied

1 By the end of next term,we _will finish___(finish) three books.

will finish

By the end of next term 到下个学期末，未来要发生的事情，用将来式。

2 When the policeman arrived ,the robber ___(disappeared) downstairs.

disappeared

当警察到达arrived的时候，过去发生的事情，过去式。
3 How long __had_ Tom __studied_(study) Chinese before he came to China.

before he came to China. 在他来中国之前，came表示发生在过去，在过去发生的事情之前，用过去完成时。

I didn't see him .but i _had heard__(hear)him __go_(go) downstairs

had heard go
didn't see him 表示过去发生的事，根据语境，应该是在