一言难尽!建议找一本语法书,从头学起.这里仅简单讲一下that的部分用法.1.that 可作为“连接代词”,引导宾语从句,可以省略.I told him (that) I wouldn't go there.2.that可以做“关系代词”,引导定语从句.如果that在...