13. Why don’t you do sth.与Why not do sth.用来委婉地提出建议，要求等
e.g. Why don’t you talk to your parents?
Why not do your homework?
14. till, until与not…until的用法辨析：
(1) till与until的意思相同，till多用于口语，until多在正式文体中使用。但在句首时，只能用until。在肯定句中，谓语动词为延续性动词时，表示“直到……为止”；在否定句中，谓语动词为终止性动词时，表示“直到……才”，常用“not…until”的结构;
(2)not until位于句首时要用部分倒装结构（主句）。
e.g. I’ll wait until/till he comes back,
Until you told me I didn’t know what she said.
Not until after the war did they meet again.
Not until he told me did I know it.
15. on the weekend = on weekends意为“在周末”；
on the weekday = on
weekdays意为“在工作日”
e.g. They like go camping on the weekend.
Many young people must go to work on weekdays.
16. compare的用法辨析：
(1) compare…with… 表示“把……与……相比”（同类相比）；
(2) compare…to… 表示“把……比作……”（异类相比；比喻）
e.g. He compared my room with his room.
A teacher’s work is often compared to a candle.
17.between与among的区别：
(1) between…and … 意为“在……和……之间”，通常指两者之间；
(2) among意为“在……之间”，通常指三者或三者以上之间。
e.g. The restaurant is between the supermarket and the bookstore.
There are many flowers among trees.
18. busy的用法辨析：
(1)be busy with sth.意为“忙于某事”；
(2)be busy doing sth.意为“忙于做某事”。
e.g. I was busy with my children.
I was busy looking after my children.
He is busy doing his homework.
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