what 不能少,因?yàn)樾枰侵髡Z從句,what不可以省略——(NOt accustomed to） ——speaking in public makes me very anxious.i will try my best to help him to overcome it 這一句答案用that he is not accustomed to 也是主語從句嗎，that能省略嗎？也是主語從句，這里that可以省略。因?yàn)樯弦痪?，i couldn't put up with需要加上賓語，what作為賓語在從句里是提前到句首了。而這句he is not accustomed to speaking in public 已經(jīng)是完整的句子了，句首可以加that或者不加那為什么that he is not accustomed to==His not being accustomed to后面是什么結(jié)構(gòu)？很He is not being accustomed to speaking in public是完整的主語從句，意思是他不習(xí)慣在公共場合說話，作為主語。整句的意思是不習(xí)慣在公共場合說話讓我很緊張。