第一个是过去时,指的是在过去那个时间点还没.第二个是一般现在式,指的是在现在这个时间点还没.
过去完成时,就是过去的过去,组成形式是had + 过去分词
先举一个过去时的例子 I went to bed.我睡觉去了
再举一个过去完成时的例子 I went to bed after I had washed my face.
很显然洗脸这个动作发生在睡觉之前 这个就是过去的过去 要用过去完成时
did not know yet和don't know yet有什么区别?
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