神马作文网It is ten years 是before还是since还是until he come back
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It is ten years 是before还是since还是until he come back
麻烦帮我讲下before.since,until在这种句子中的区别
那如果前面是过去式用什么？
如果是完成时用什么呢？
麻烦帮我讲下before.since,until在这种句子中的区别
那如果前面是过去式用什么？
如果是完成时用什么呢？
是before词义“在...时间之前”,而since词义是“自从.时间以来”,until是“一直到.时间”,显然,后两个词的词义是不合适的.
再问： 那如果前面是过去式用什么？ 如果是完成时用什么呢？
再答： It was ten years before he came back. It had been ten years until/ before he came back.
再问： since在什么情况下用呀
再答： It has been ten years since he came back. It is ten years since he came back. since表示从过去一个时间点到现在，所以句中应该是现在时态，现在完成时和一般现在时都属于现在时态。
再问： 那如果前面是过去式用什么？ 如果是完成时用什么呢？
再答： It was ten years before he came back. It had been ten years until/ before he came back.
再问： since在什么情况下用呀
再答： It has been ten years since he came back. It is ten years since he came back. since表示从过去一个时间点到现在，所以句中应该是现在时态，现在完成时和一般现在时都属于现在时态。
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