16. You are a great help.你帮了大忙
17. I couldn't be more sure.我再也肯定不过。
18. I am behind you.我支持你。
A: Whatever decision you're going to make, I am behind you.
19. I'm broke.我身无分文。
20. Mind you!请注意!听着!(也可仅用Mind。) 模范例句:Mind you! He's a very nice fellow though bad-tempered.