补全下列句子中被省略的成分（英语）1.The heavy rain prevented him arriving there on time.

1 him后加from prevent sb (from) doing sth
2 we后加should 虚拟语气中省略了should
3 said后加that 省略了宾语从句中的关系连词that
4 when后加you are 这是从句省略的情况，①主句 从句主语一致，②从句中含有be动词的任何形式（①②是要同时满足的）
5 前半部分改为 If there should be a flood,这是虚拟语气省略If,should提前的情况。

是要回答第一句嘛？

1. The heavy rain prevented him FROM arriving there on time.

The heavy rain prevented him (from)arriving there on time.
It is suggested that we (should) go to see the film
3.He said the text was very important and that we should learn it by heart.
4.When neccessary you can help us to do something.
5.Should there be a flood,what should we do?