when while 引导从句时的区别
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yesterday he received atelephone call,says him that his mather was ill
中为什么用says 而不用saying 或said
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with 做“因为”解释的时候 与because的区别
參考答案:1.when 和while 都可以引导时间状语从句
但是when 后面的谓语动词可以是短暂性动词，也可以是延续性动词，但while后的谓语动词只能是短暂性动词。
比如说，The lights turn off when the clock strikes 12.只能用when ,不可以用while.
可以说 I worked very hard when/while i was at college.
2.says 前面的主语是电话，而不是he,当然这是一种不太规则的用法。多用于口语中。
3.with后面跟名词或名词性短语。而because 后跟原因从句。
