1. Why don't you…？等提建议的句型及其常用答语。
①Why don't you go to sleep earlier this evening?
②You should talk to him so that you can say you're sorry.
③Maybe you could go to his house.
以上三句均是提建议的句子。
在英语中，提建议的常用表达有：
（1） Why don't you do sth？
=Why not do sth？
你为什么不做某事呢？
Why don't you talk to your parents?
＝ Why not talk to your parents？
（2） What／How about (doing) sth？（做）某事怎么样／好吗？
What／How about having dinner with me？和我一起去吃晚饭好吗？
（3） Let's do sth 咱们做某事吧。
Let's make a birthday card for her. 咱们给她制作一张生日贺卡吧。
（4） You should (not) do sth
你（不）应当做某事。
You should (not) do more exercise.
你（不）应当多锻炼。
（5） You'd better (not) do sth
你最好（不）做某事。
You'd better (not)go out.
你最好（不要）出去。
（6） Would you like sth／to do sth？
你想要某物/做某事吗？
Would you like to have a try？
2. 连词until, so that及 though/although引导的状语从句
You should keep trying to talk to her until she talks to you. 你应当继续同她说话，直到她和你说话为止。
He should talk to his friend so that he can say he's sorry. 他应和他的朋友该谈，以便他可以说声抱歉。
Although she's wrong, it's not a big deal．尽管她做得不对，但也没什么了不起的。
以上三句中,until引导时间状语从句,so that引导目的状语从句,although引导让步状语从句。
（1）until引导时间状语从句连词until意为“直到……为止；到……时”，引导时间状语从句，常放在主句之后，也可以放在主句之前。主句为一般将来时，从句要用一般现在时表示将来。
until用于肯定句中，意为“直到…为止”，主句谓语动词须用延续性动词；用于否定句中，意为“直到……才……”，主句谓语动词通常用非延续性动词，也可用延续性动词。
She often works in the field until it gets dark. 她经常在田里干活到天黑.
We didn't go home until the rain stopped. 直到雨停了，我们オ回家。
I won't believe it until I see it with my own eyes. 直到亲眼看见，我才会相信
（2）
①so that意为“以便”，引导目的状语从句时，一般放在主句后，且不用逗号隔开。目的状语从句表示动机（即一种可能性），而非事实，因此，从句中常带有can，will，could，would，should等情态动词。
I got up early so that I could catch the early bus. 我起得早，以便能赶上早班公共汽车。
You must go now so that you won't be late. 你必须现在就去，以便不会迟到。
②so that意为“以至于；结果”，引导结果状语从句，陈述的是客观事实，常常不带情态动词。
He studied hard so that he passed the exam. 他努力学习，结果通过了考试。
（3）although引导让步状语从句连词although意为“虽然；尽管；即使”，引导让步状语从句，可以放在主句前面，也可以放在主句后面。
Although you are tall, I'm not afraid of you. 尽管你个子高，但我不怕你。
You could help him although you didn't let him copy your homework. 尽管你不让他抄你的作业，但你可以帮助他。