what和how引导的从句They want to know _________do to help us.答案是填what.那么为什么不能用how呢?在此句子中,what充当从句的什么成分?

what和how引导的从句用法,简洁一些. what和how引导的从句They want to know _________do to help us.答案是填what.那么为什么不能用how呢?在此句子中,what充当从句的什么成分? 为什么what和how不能引导定语从句? what引导的从句 英语how与what引导的从句怎样用 what和how引导的所有 祈使句 how,whether,what能否引导定语从句 how fast they are running 转成 what引导的感叹句 what引导主语从句和which引导的主语从句有什么区别 宾语从句引导词what和that的区别 宾语从句引导词what和that的区别 求what和whatever引导从句的区别RT 区分what和that、which引导的宾语从句, 引导从句时 what which 和 that 的区别定语从句和宾语从句都说说 what可以引导定语从句吗?和which引导的有什么区别 what和how引导的感叹句如何区别 how和what引导的感叹句如何区分?结构是什么? They get terrible news.变为感叹句（用what和how来引导）