1. You should make good use of... 你应该充分利用…….

You should make good use of your spare time to practice English.
你应该充分利用空余时间操练英语.

2. You should never... 你绝不应该…….

You should never flap about. What is needed is your solid action.
你绝不应该讲空话,需要的是你的实际行动. [ flap about:(俚)讲空话;闲聊]

3. You were (not) supposed to... 你本(不)应该…….

Jim, you were supposed to call three hours ago! 吉姆,你应该在三个小时以前打电话过来的!

4. You will be able to... if... 如果……,你将能够…….

You will be able to get accepted by a top law school if you can pass the exam.
如果你能通过考试,你将能够被一所一流法学院录取.

5. You'll never guess... 你永远猜不到…….

You'll never guess who telephoned me just now — my cousin from America!
你绝对猜不到刚才谁给我打电话——我美国的表姐!

6. raise the red flag 报警，引起注意

If you write too much on democracy, it will raise the red flag and the National Security guys will watch you.
如果你写太多关于民主的文章，就会引起当局的注意，国-安局的人就会盯上你。

7. He is spending like a drunken sailer.

Sailer(水手)一到一个海港便急着找地方花钱，所以形容一个大手大脚就说他花钱像一个喝醉了水手。

8. After nap, I feel foggy for a while.

午睡后，我会云里雾里一阵子。

9. Democracy is the defining issue of our time.

民主我们这个时代最强的诉求。define 定义，区别事物最重要的证据。

10. or what 美国人喜欢在句末用这个词组。

Are we good friends or what 我们可不是好朋友？Are you going or what 你到底去不去？