如何区别宾语从句中that,which,who,whom,if,whether的用法?答:由because引导的从句如果放在句末,且前面有逗号,则可以用for来代替。但如果不是说明直 接原因,而是多种情况加以推断,就只能用for。 如:He is not here, because / for his mother is ill. 目的状语从句:表示目的状语的从句可以由in order that, so that,等词引导。如: You must raise your voice so that...