since打头的句子要用什么时态?列如：Sincet helen is angry ,weA had better lleaving her alone B should leave her alone C might as well leave her alone D had rather leave her alone

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since打头的句子要用什么时态?列如：Sincet helen is angry ,weA had better lleaving her alone B should leave her alone C might as well leave her alone D had rather leave her alone since引导的句子主句和从句分别用什么时态? ever since 和since 还有since then 有什么区别?它们分别用在什么时态..在句子的哪个位置?怎么用? 加since的句子时态的用法句子后面+since,前面的时态应该用什么.比如 I___here since I was a child.A.have been staying B.had been staying C.stayed D.have stayed E.had stayed since 时间 ago 1.since +时间 +ago 2.since 后可以跟个时间,或是直接接句子..那是用在什么时态里面.主句要是什么时态? 初中英语的since前后都用什么时态 Since引导的从句一般要用什么时态.?要全还有例句喔..谢了.. since前用什么时态,后用什么时态 since two years ago与since two years的区别,分别用在什么时态? ever since 的用法ever since 和什么时态连用? since主句用什么时态从句呢? since前后该用什么时态啊? Since 用在什么时态中 since用于什么时态 since用于什么时态 句子中有since或for用什么时态,结构是什么? 如果主句是现在完成时态,那么回答它的句子如果有since,那么since后接什么时态,为什么 分析这个英语句子的时态和句意!it is／was 3 years since he came here.since不一定和完成时连用吗?用is或was有什么区别 为什么since不能用做that?