The reason is __________ he is unable to operate the machine.为什么不用why?

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The reason is __________ he is unable to operate the machine.为什么不用why?
The reason is __________ he is unable to operate the machine.
为什么不用why?

The reason is __________ he is unable to operate the machine.为什么不用why?
因为is 后面引导的是表语从句,而不是原因状语从句,所以只能用that,不用why(why一般后面接的是结果,表原因要用because)

用that,reason的同位语。
你要用why的话是这种情况: the reason why he is late is that it is raining hard.

因为这是一个表语从句,be 动词后用表语,所以应用that ,而不用why

同意一楼:be 动词+表语从句 一般动词 +宾语从句 例句: My hope (is )that he will be the best student in the class. (表语从句)我的愿望是