If you would like to make a comment or insert a remark in an ongoing conversation, it is polite to acknowledge what someone has just said before stating your own ideas.假如你想对一个正在进行的谈话进行评论或插话，在表明我们的看法之前，先评论下别人说的话是很礼貌的。
Some phrases
That's interesting. I think that...
Interesting point. I would add...
Hmmm. I hadn't thought of that before.
Questions can also be a useful way of bringing new ideas into a conversation:
What do you think about . . .
Have you considered . . .
What about . . .
Sometimes a more direct approach is appropriate:
Can I add something here?
mind if I interject something here?
