from, since(A) from表示“时间的起点”,可译作“从……”,多用于“from…to/till…”中。如:You can come anytime from Monday to Friday. 周一至周五你什么时间来都行。(B) since表示“自从……以来(直到现在)”。如:He has been away from home since 1973. 他自从1973年就离开了家乡。We have known each other since ten years ago. 我们十年前就认识了。注意:for和since都常与完成时连用,但for接时间段,since接时间点。如for two hours(持续)两小时;since last week从上周直到现在。
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