作业帮例：three years ago/three years before 如何判别该使用什么时态?
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例：three years ago/three years before 如何判别该使用什么时态?
例：three years ago/three years before 如何判别该使用什么时态?
例：three years ago/three years before 如何判别该使用什么时态?
它们都是三年前的意思.三年前是过去,所以用过去时态,但是具体的用法要看实际情况!
如：
你好,three years ago在句子中可以单独使用,并且要用一般过去时态,如下面的句子:
He came here 3 years ago.
three years before 是不能单独使用的,一定要用在句子,主要句子结构如下:
It will be 3 years before we meet each other.
三年后我们将再见面,
It ...
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你好,three years ago在句子中可以单独使用,并且要用一般过去时态,如下面的句子:
He came here 3 years ago.
three years before 是不能单独使用的,一定要用在句子,主要句子结构如下:
It will be 3 years before we meet each other.
三年后我们将再见面,
It was 3 years before we got married.
过了三年我们才结婚.
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例：three years ago/three years before 如何判别该使用什么时态?
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