作业帮since 和for 的区别、
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/26 01:36:58
since 和 for 的区别，用法，句型。
解题思路： 如下
解题过程：
since 和for 主要用在现在完成时态中。
现在完成时态可以表示过去发生的动作或存在的状态，一直持续到现在，也许还将继续下去。
此时的动词须为延续性动词，可与表示一段的时间状语连用。如：“since + 过去的点时间或从句”或“for + 时间段”。例如：
I have never met him since last month. 自从上月到现在我从未见过他。（现在还没见面）
They have lived in Beijing since 1949. 他们从1949年起就住在北京。（现在还住在北京）
They have lived here since 2002. 自从2002年以来，他们就住在这里。
He has taught us since I came to this school. 自从我来到这所学校，他一直在教我们。
I have been ill for a week. 我已病了一周了。（现在还在生病）
I’ve known Li Lei for three years. 我已经认识李磊有三年了。
He has been at this school for over two years. 他在这个学校已经有两年多了。
我们可以总结为：
①since＋一段时间＋ago＝for＋时间段;
since two weeks ago=for two weeks;
I have kept the library book for a week. = I have kept the library book since a week ago.
②since + 时间点＝for＋时间段
since 2000=for 10 years
I have lived here since 2000. = I have lived here for 10 years.
③since +从句（常用一般过去时）
The Greens have lived in Beijing since they moved to Beijing from Paris.
同学你好，很高兴为你解答。如有疑问请留言，祝你英语越来越棒！
最终答案：略
解题过程：
since 和for 主要用在现在完成时态中。
现在完成时态可以表示过去发生的动作或存在的状态，一直持续到现在，也许还将继续下去。
此时的动词须为延续性动词，可与表示一段的时间状语连用。如：“since + 过去的点时间或从句”或“for + 时间段”。例如：
I have never met him since last month. 自从上月到现在我从未见过他。（现在还没见面）
They have lived in Beijing since 1949. 他们从1949年起就住在北京。（现在还住在北京）
They have lived here since 2002. 自从2002年以来，他们就住在这里。
He has taught us since I came to this school. 自从我来到这所学校，他一直在教我们。
I have been ill for a week. 我已病了一周了。（现在还在生病）
I’ve known Li Lei for three years. 我已经认识李磊有三年了。
He has been at this school for over two years. 他在这个学校已经有两年多了。
我们可以总结为：
①since＋一段时间＋ago＝for＋时间段;
since two weeks ago=for two weeks;
I have kept the library book for a week. = I have kept the library book since a week ago.
②since + 时间点＝for＋时间段
since 2000=for 10 years
I have lived here since 2000. = I have lived here for 10 years.
③since +从句（常用一般过去时）
The Greens have lived in Beijing since they moved to Beijing from Paris.
同学你好，很高兴为你解答。如有疑问请留言，祝你英语越来越棒！
最终答案：略