6.need

【用法】v. 需要。做实义动词，可以直接带宾语，也可以和带to的不定式连用，可用于各种结构。

【例句】1. I need some help. 我需要一些帮助。

2. They didn't need to go. 他们不必去。

3. The bike needs to be repaired. 这辆自行车需要修理。

【拓展】need做情态动词。need做情态动词表示"需要",主要用于否定及疑问句中，没有时态与人称的变化，后加动词原形。

【例句】-Need I come? 要我来吗？

-Yes, you must. 是，你得来。

-No, you needn't. 不，你不必来。

【即学即练】

1. - What sort of house do you want to have? Something big?

- Well, it be big - that's not important.

A. mustn't B. needn't C. can't D. won't

2. "Must we do it now?" "No, you _____."

A. won't B. needn't C. can't D. don't

3. You _____ to the meeting this afternoon if you have something important to do.

A. needn't to come B. don't need come

C. don't need coming D. needn't come

4.You _____ return the book now. You can keep it till next week if you like.

A. can't B. mustn't C. needn't D. may not

7.mix

【用法】v. 混合；混在一起。常用短语mix up 搅匀；搅和；混淆；弄乱,其结构为动词加副词构成，后接名词或代词做宾语，名词可以放在中间或者后面，代词只能放中间。

【例句】1. You should mix up all the ingredients. 你要把所有的材料混合起来。

2. It's too easy to mix him up with his brother. They look the same.

8.finally

【用法】adv. 最后地；最终可放于句首、句中或句末。其形容词为final。

【例句】1. I worked out the maths problem finally. 最终我算出了那道数学题。

2. We are getting ready for the final exam. 我们正在为期末考试做准备。

8.turn on

【用法】turn on意为"打开，旋开（电灯、煤气、自来水、无线电等）"，其反义词组是turn off "关（水源、煤气、电灯等）。

注意："开（关）门、窗、盒子"等用动词open和close。

【例句】1. It's too dark.. Please turn on the light. 太黑了，请开灯吧。

2. Please turn off the TV when you leave the room. 离开房间的时候请关掉电视机。

【考查点】短语辨析：turn on, turn off, turn up, turn down

turn on意为"（把水源、煤气、电源等）打开"，其反义词组为turn off；