作业帮If he _____(know) that,he would tell you.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/01 00:44:35
If he _____(know) that,he would tell you.
If he _____(know) that,he would tell you.
If he _____(know) that,he would tell you.
knew,主句是过去将来时,从句用一般过去时
knows
had known
known
knew 虚拟语气
knew
knows.
首先，原句不是虚拟语气。
为什么呢？因为如果这个句子是虚拟语气，句子只能这么说：
If he had known, he would have told you.
这里，后半句之所以要用现在完成时 have told， 是因为”他告诉你“这个动作在说这句话的时候就已经完成了，然而这个句子要表达的情景与现实恰恰相反，所以前半句 if 后面的时态要退后一个...
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knows.
首先，原句不是虚拟语气。
为什么呢？因为如果这个句子是虚拟语气，句子只能这么说：
If he had known, he would have told you.
这里，后半句之所以要用现在完成时 have told， 是因为”他告诉你“这个动作在说这句话的时候就已经完成了，然而这个句子要表达的情景与现实恰恰相反，所以前半句 if 后面的时态要退后一个才能表示虚拟的语气，也就是说，从现在完成时退后到过去完成时，所以前半句要用 had known。
再举一个虚拟语气的例子给楼主比较：
If you had done the training, you wouldn't have made the mistake.
如果你早完成了培训，你就不会犯那样的错了。
其次，原句中的 would 并不是用来表示过去时，而是作为情态动词，就像 Could I help you？ 并不是 Can I help you 的过去时一样。这里的would 只是表示委婉.
所以答案是 knows.
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