英语 语法之since和for

　　Since 用来说明动作起始时间，for用来说明动作连续时间长度。

英语 语法例如：I have lived here for more than twenty years.我住在这儿二十多年了。  

I have lived here since I was born. 我从出生起就住在这儿了。  

留心：并非有for 作为时光状语的句子都用当初实现时的英语  语法。

I worked here for more than twenty years. （我当初已不在这里工作。）  

I have worked here for many years.（现在我仍在这里工作。）  

留神：用句型转换的方法，很容易打消非持续动词在有for/since结构的实现时中的误用。  

1）（对） Tom has studied Russian for three years. = Tom began to study Russian three years ago, and is still studying it now.  

2）（错） Harry has got married for six years. = Harry began to get married six years ago, and is still getting married now.  显然，第二句过错，它应改为 Harry got married six years ago. 或 Harry has been married for six years.   CopyRight .com

since的四种英语 语法用法

1） since +从前一个时间点（如具体的年、月、日期、钟点、1980, last month, half past six）。例如：I have been here since 1989. 1989起，我始终在这儿。  

2） since +一段时间+ ago。例如：I have been here since five months ago. 我在这儿，已经有五个月了。  

3） since +从句。例如：Great changes have taken place since you left. 你走后，变更可大了。  Great changes have taken place since we were here. 咱们走后，变革可大了。  

4） It is +一段时间+ since从句。英语 语法例如：It is two years since I became a postgraduate student. 我考上研究生有两年了。

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