同位语从句的前面一定有个跟同位语意思相同的词,比如随便一个句子:The question that how to do housework should be discussed.怎么样做家务应该讨论一下.that 后的how to do housework就跟question是一个内容,用来解释question的,所以是同位语. 插入语是可以去掉的一部分,去掉后不会影响句子的大致意思.如:Who do you think did this?你认为这是谁做的?do you think 就是插入语.常用的插入语还有as it were等.呵