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英语翻译1.He has had several jobs since he graduated form Yale.2

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英语翻译
1.He has had several jobs since he graduated form Yale.
2.He has had several jobs since he was a student at Yale.
为什么语法书上解释说这两个句子的意思是相近的.
同样下面一句
It's two weeks since I was ill.语法书上讲这个since i was ill 等于since i recovered.
这又是为什么?
在这里was 怎么了?我还是没有豁然开朗的感觉啊。
英语翻译1.He has had several jobs since he graduated form Yale.2
1.他从耶鲁大学毕业后已经有过几个工作.
2.自从他不在是耶鲁学习以来,他已经有过几个工作了.
since作为连词“自.以来”讲时,引导的从句谓语既可以是延续性的,也可以是瞬时性的.
但都表示是动作的完成,故谓语是延续性动词时,表示“不在那个动作状态”.
it's two weeks since i was ill=it's two weeks since i recovered.