几个现在完成式的英语问题。
1.already和yet的区别。
2.You are late.The film began 10 minutes ago.(同义句)
A:You are late.The film _____ _____ _____ for 10 minutes.
B:You are late.It ____ten minutes since the film _____.
要求说明每个题的知识点。
2. A. the film has already began for 10 minutes.
begin 瞬间动词 has already began for 10 minutes 现在完成时表示该事件10分钟前已经发生
B. It has been ten minutes since the film began.
这里用 it has been 表示从开演到现在已经持续了10分钟了 has been doing 表示事件已经发生而且延续到现在
2，A.has been on 现在完成时表示过去进行了一段时间且还有可能继续下去，这里for ten minutes是一段时间电影肯定还会继续的，所以A要用has been on
B. is, started. 本来用since引导从句时，主句是要用完成时的，但一种特殊情况除外，就是这里主句是表示一段时间，则主句可用现在完成时，也可以用一般现在时，就是说这里可以填has been，也可以填is，但既然只有一空，当然填is了；至于第二空，应该没什么疑问吧，“电影开始”是过去发生的一件事，用一般过去时
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