大师作文网while as when since
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请老师总结一下while as when since 的区别和用法
解题思路： as , when , while 和since 的区别和用法。 1 when 后经常跟短暂性动词，经常用一般过去时。 2 while 后经常跟延续性动词，经常用过去进行时。 while还可以用来表示对比 3 表示一边----一边，随着 4 since从过去到现在，后加短暂性动词，用一般过去时。
解题过程：
as , when , while 和since 的区别和用法。
1 when 后经常跟短暂性动词，经常用一般过去时。
2 while 后经常跟延续性动词，经常用过去进行时。
while还可以用来表示对比
3 表示一边----一边，随着
4 since从过去到现在，后加短暂性动词，用一般过去时。
例如：
1 I was reading when he came in
2 He was doning nothing while his wife was cooking
3 As time goes on ,I realize the importance of English
4 I have been here for three years since I graduated.
最终答案：略
解题过程：
as , when , while 和since 的区别和用法。
1 when 后经常跟短暂性动词，经常用一般过去时。
2 while 后经常跟延续性动词，经常用过去进行时。
while还可以用来表示对比
3 表示一边----一边，随着
4 since从过去到现在，后加短暂性动词，用一般过去时。
例如：
1 I was reading when he came in
2 He was doning nothing while his wife was cooking
3 As time goes on ,I realize the importance of English
4 I have been here for three years since I graduated.
最终答案：略
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