300. 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!

299. 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。

298. 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！

297. 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]

296. 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。

294. You should avoid doing sth. 你应该避免做某事。

You should avoid being late for school.　 你应该避免上学迟到。

293. You really have to do something about...

你的确应该处理一下…。／你真得为…做点什么了。

You really have to do something about your poor pro­nunciation.

你真得为你糟糕的发音做点什么了。

292. You don't need to... …你没必要……。

You don't need to do all that was required of us.　 你没必要做要求我们做的一切。

291. You don't have to... …你没必要……。

You don't have to be present.　 你不必到场。