所謂插入語指的是對一句話所做的附加的解釋.最常見的插入語有：
1.That will be a good beginning,I hope.
2.We'll have to take an umbrella,I' m afraid.
3.I have no money,you see.
4.He is a bad guy,you know.
5.Mr.Smith,I think,is at least 50 years old.
6.This,I suppose,will give you some idea of the situation in China.
I think 如果放在句子中間將句子斷開,或是放在句末,就是插入語.如果放在句首,就不是,而是一個主句.如：I think he will help you.在這句話中,主句是I think；從句是he will help you.