The question is whether we should ask them for help.

The question is whether we should ask them for help.
为什么不能用if？if和whether有哪些区别？谢谢！

休闲派 1年前已收到3个回答举报

肉中肉人上人花朵

共回答了199个问题采纳率：20.1% 举报

lf不可以引导表语从句

1年前

千山雪燃幼苗

共回答了2个问题举报

if是如果.whether是是否.

1年前

hzm555 幼苗

共回答了9个问题采纳率：33.3% 举报

1 在动词不定式之前只能用whether 。 2 在whether …… or not 的固定搭配中。 3 在介词后，只能用whether。 4宾语从句放在句首表示强调时，只能用whether 。 5用if会引起歧义时，只用whether。如用whether可避免歧义。这里的第四点写了感谢你的细致回答，我的问题已经解决了，多谢大家的帮助哦！...

1年前

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