since引导一个时间状语从句时,时态since引导一个时间状语从句时,从句何时用一般过去式,何时用现在完成时?例如:——Have you known Dr.Jackson for a long time?------Yes,since he jioned the Chinese Society.since
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![since引导一个时间状语从句时,时态since引导一个时间状语从句时,从句何时用一般过去式,何时用现在完成时?例如:——Have you known Dr.Jackson for a long time?------Yes,since he jioned the Chinese Society.since](/uploads/image/z/5232034-10-4.jpg?t=since%E5%BC%95%E5%AF%BC%E4%B8%80%E4%B8%AA%E6%97%B6%E9%97%B4%E7%8A%B6%E8%AF%AD%E4%BB%8E%E5%8F%A5%E6%97%B6%2C%E6%97%B6%E6%80%81since%E5%BC%95%E5%AF%BC%E4%B8%80%E4%B8%AA%E6%97%B6%E9%97%B4%E7%8A%B6%E8%AF%AD%E4%BB%8E%E5%8F%A5%E6%97%B6%2C%E4%BB%8E%E5%8F%A5%E4%BD%95%E6%97%B6%E7%94%A8%E4%B8%80%E8%88%AC%E8%BF%87%E5%8E%BB%E5%BC%8F%2C%E4%BD%95%E6%97%B6%E7%94%A8%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%3F%E4%BE%8B%E5%A6%82%EF%BC%9A%E2%80%94%E2%80%94Have+you+known+Dr.Jackson+for+a+long+time%3F------Yes%2Csince+he+jioned+the+Chinese+Society.since)
since引导一个时间状语从句时,时态since引导一个时间状语从句时,从句何时用一般过去式,何时用现在完成时?例如:——Have you known Dr.Jackson for a long time?------Yes,since he jioned the Chinese Society.since
since引导一个时间状语从句时,时态
since引导一个时间状语从句时,从句何时用一般过去式,何时用现在完成时?
例如:——Have you known Dr.Jackson for a long time?
------Yes,since he jioned the Chinese Society.
since后的句子为什么是一般过去式,而不是现在完成时
since引导一个时间状语从句时,时态since引导一个时间状语从句时,从句何时用一般过去式,何时用现在完成时?例如:——Have you known Dr.Jackson for a long time?------Yes,since he jioned the Chinese Society.since
首先,since表示"自从.以来",表示的动作是从过去以来一直持续到现在,所以since引导的从句要用一般过去时态,但主句只能用现在完成时态,因为现在完成时态表示的动作就是从过去一直持续到现在.如以下句子.
I have taught English since 1999.
I have lived here since I worked here.
He has been here since he joined the army;
1 since的意思是“从....的时候开始”,一般情况下,都是从过去某时或某个动作算起,因此用
since引导的句子都是一般过去时。
2 现在完成时表示“从过去某时开始延续到现在的动作”,和since引导的从句搭配正合适。
常用的句子结构就是 现在完成时+since从句
eg I have been here since I was born....
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1 since的意思是“从....的时候开始”,一般情况下,都是从过去某时或某个动作算起,因此用
since引导的句子都是一般过去时。
2 现在完成时表示“从过去某时开始延续到现在的动作”,和since引导的从句搭配正合适。
常用的句子结构就是 现在完成时+since从句
eg I have been here since I was born.
供参考。
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看例子
1. It has been 3 years since he began to smoke 自从他开始吸烟已经三年了
2. It has been 3 years since he smoked 自从他不吸烟已经三年了
3. It has been 3 years since he has smoked 自从他不吸烟已经三年了
根据例...
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看例子
1. It has been 3 years since he began to smoke 自从他开始吸烟已经三年了
2. It has been 3 years since he smoked 自从他不吸烟已经三年了
3. It has been 3 years since he has smoked 自从他不吸烟已经三年了
根据例子,since后的句子如果是一般过去时,短暂性动作表示自从做。。。已经。。了如例句1
延续性动作表示 自从不做。。。已经。。。了 如例句2
如果是完成时态,也表示自从不做。。。已经。。。了 如例句3
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