15. at once == right away 立刻 马上 如：

Do it at once. 马上去做。

I’ll go there at once/ right away. 我马上去那里。

16. one day 有一天 (指将来/过去)      

some day 有一天(指将来) 如：

One day I went to Beijing. 有一天我去了北京。

Some day I’ll go to Beijing. 有一天我将去北京。

Unit3 Could yoplease clean your room?

1. 关于 to 的短语总结

have to do sth. 不得不/必须做某事

need to do sth. 需要做某事  

hate to do sth. 讨厌做某事

like to do sth. 喜欢做某事  

want to do sth. 想做某事

love to do sth. 热爱做某事  

forget to do sth. 忘记做某事

start to do sth. 开始做某事  

begin to do sth. 开始做某事

ask sb to do sth. 请某人做某事

2. ---Could yoplease clean your room?

---Yes, sure. / Sorry, I can't. I have to do my homework first.

---Could I please use the car?

---Sure. / Certainly. / Of course. / No, yocan't. I have to go out.

在表示请求帮助或请求允许的疑问句中，常用 could 代替 can，以表示礼貌，委婉或不确定的语气，而 can 则不具备这些语气。这种情况下不能把 could 看作 can 的过去式。以上两句中用 could 是为了表示礼貌的请求。表示请求帮助或请求允许时，除了 can, could 之外，还可以用 may，句子的表达方式也各有不同，可以用不同的方式来表示同一个概念。例：

Could / Can / May I use your car for a day?

作允答可以各种各样：

如同意可以说 Yes，或 Sure 或 Certainly，还可说 Yes, (do) please.或 Of course. (yomay / can). 或 That's OK / all right.

如果不同意，可以说 I'm sorry yocan't. 或 I'm really sorry, but I have to use it today. 要避免说 No, yocan't. 这样显得很不礼貌。否定回答通常用委婉语气。

Unit4 Why don’t yotalk to your parents?

1. get  

( 1 ) 买

get sth. for sb. = get sb. sth.  为某人买某物

Can yoget some fruit for me when yogo shopping ?

= Can yoget me some fruit when yogo shopping ?

( 2 ) 得到，到达

Where did yoget the  book?

When  did  yoget the letter?

He got home late last night.

（3）使，让，get + 宾语 + 宾补    使某人/某物怎么样

Please get yocoat clean.