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I went to the window to make sure whether something had happ

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I went to the window to make sure whether something had happened.这个句子中的whether是不是错误的?
I went to the window to make sure whether something had happ
make sure确定 后面应该加that从句或者是一般式
这里应该是I went to the window to make sure that something had happened 或者make sure something happened
还有就是当用到“是否...”时whether可以用,这里有个敲门.凡是这个意思中if可以用whether就能用,但后者能用前者就不一定,所以whether是万能的