6.sb is all talk某人只是说说而已；某人只会空谈
I didn't let him deter me. He was all talk.我没有被他吓倒, 他只不过是说说而已。
7.talk is cheap
(expressing doubt, disbelief)光说没有用；说起来容易
8.to be the talk of sth
(popular topic)成为…的话题
For a couple of weeks she was the talk of London.两周以来, 她一直是伦敦的话题人物。