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before的时态怎么判断

before的时态怎么判断

Before 在英语中是一个比较常用的虚词,它既可作介词或副词用,也可作从属连词用。

具体用法

1.表示“在…..之前就…..”。

Mary had finished her homework before her mother returned.

2. 表示“过了多久后才…….. ,动作进行到什么程度才……”

The man almost knocked me down before he saw me .

They walked about 30 miles to the west before they saw a village .

They worked day and night about three days before everything returned to normal .

3. 表示“来不及; 尚未…..就…”

Before I could get in a word , he had measured me .

He ran off before I could stop him .

She left the company before I could have a word with her .

4. 表示“刚…就…”

I had hardly sat down before the bell rang.

5. 表示“不知不觉就…..; 还没弄清就……”

Time passed quickly and three months went by before Aqiao knew it.

6. 表示“宁愿…,决不…,与其…,毋宁….”常与will 或would 连用。

I would die before I would tell

I’d shoot myself before I apologized to him.

I would / will die before I surrender .

7. 表示“否则;以免”

Do it now before you forget . I will write it down before I forget it .

8. 用于句型“it was +时间段+ before …” 表示 “过了多久才…”

It was three days before he came back. .

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