推荐回答(1个)
since后的从句用一般过去时。
2.如since如果解释为“自从.以来”,引导时间状语从句时,则其前面的主句用现在完成时。
3.其后如果是从句则用一般过去时,引导时间状语(从句)时:其后的从句用一般过去时(其前面的主句用现在完成时。
一. 基本概念
时态(tense)是一种动词形式,不同的时态用以表示不同的时间与方式。它是表示行为、动作、状态在各种时间条件下的动词形式,在英语中有16种时态。
二. 种类
所谓"时"就是行为发生的时段或状态存在的时段,有完成状态、进行状态、完成进行状态或一般状态四种。由时和态结合,便形成下列十六种时态:
一般现在时,一般过去时,一般将来时,一般过去将来时;
现在进行时,过去进行时,将来进行时,过去将来进行时;
现在完成时,过去完成时,将来完成时,过去将来完成时;
现在完成进行时,过去完成进行时,将来完成进行时,过去将来完成进行时。
三. 转换
一般过去时与现在完成时的转换:
A. He joined the League two years ago.
B. He has been in the League for two years.
C. It is two years since he joined the League.
D. Two years has passed since he joined the League.
2.一般现在时与现在进行时的转换:
Peter is at work,but Mike is at play.Peter is working,but Mike is playing.
3.现在进行时与一般将来时的转换请看:
The train is leaving soon.The train will leave soon.
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