we don't know how to do that.We don't know what ma

发布时间:2021-02-27 22:25:34

we don't know how to do that.We don't know what makes us laughhow 后边为什么加 to 而what后不加呢

网友回答

how to do that是不定式短语做宾语,也可以用how we can do that,是宾语从句.而what makes us laugh是宾语从句,且what 在从句中做主语,所以what 后面不加to.
以上问题属网友观点,不代表本站立场,仅供参考!