九年级英语下教案人教版Unit 12 You’ re supposed to shake hands 重难点解析(2)

Unit 12 You’ re supposed to shake hands 重难点解析（2）

1. be supposed to do sth.

被期望做某事，应该做某事

肯定句/否定句/疑问句，一般现在时/一般过去时，这样的变化都体现在be动词上。请看例句：

Japanese are supposed to bow when they meet people for the first time.

I am not supposed to bow, I am supposed to shake hands when I meet people for the first time.

I was supposed to come at 7:00, but I came at 8:00.

2 point 的用法

point at sb. 指着某人

It’s not polite to point at others.

用手指着别人是不礼貌的。

point + 名词/代词削尖(铅笔)，增加……的力量

He told a story to point his advice.

他将了个故事以增强他的说服力。

come to the point 到紧要关头，到达要点

When it came to the point, he refused his help.

到紧要关头时，他拒绝援助。

point out 指出，使注意

We’ll correct our mistakes whoever points them out.

无论谁指出我们的错误，我们都会改正。

to the point 中肯

The reply was short and to the point.

回答得简明扼要。

3…should have arrived…

这是should have + 过去分词的用法，表示过去本该做某事，但实际上却没做。如果是shouldn’t have + 过去分词，表示过去本不该做某事，那么意味着已经做了。

You are right. I should have thought of that.

你说得对，我本应该想到这一点。

It’s sunny all year round here. I shouldn’t have taken an umbrella with me.这里一年四季天晴。我本不该带伞的。

4 几个used的用法

在本单元、第2单元和10单元中，都出现了used，用法还不一样，我们集中一起来学习一下。请先看例句。

1. I used to be afraid of the dark.

我过去常常怕黑。

2. Light bulbs are used for seeing at night.

电灯是被用来晚上照明的。

3. I’m gradually getting used to things.

我渐渐习惯了这些事情。

句1是used to do sth. 是“过去常常怎么样/做什么”的意思。其中used可以把它看作是个过去式，那么在变成否定句和疑问句时，我们要借did帮忙，而且注意did 后要放原形。所以这句话我们可以变成: I didn’t use to be afraid of the dark. 我过去不常常怕黑。Did you use to be afraid of the dark? 你过去常常怕黑吗？

句2：be used to do sth. be used for doing sth. 这两个用法都表示某物被用来干什么。注意前者to后要放动词原形。后者介词for 后要用动词的-ing形式。比如例句也可以改成：Light bulbs are used to see in the dark. 否定句和疑问句就是在be 动词上动脑筋，used不变。我们把句2变成否定句，就是：Light bulbs are not used for seeing at night. 变成一般疑问句即是：Are light bulbs used for seeing at night? 句3：be/get used to doing sth. 习惯于做某事。注意这里的to是个介词，所以后面的动词一定要加-ing。be used to doing sth. 在句中做谓语时，变否定句和疑问句都是在be动词上动脑筋，used不变。get used to doing sth. 在句中做谓语时，变否定句和疑问句要借do/does帮忙。

5 it is + adj.（形容词）+ for sb.+ to do sth.

对某人来说做某事怎么样

It is difficult for me to practice the violin every day.

对我来说，每天练习弹小提琴很困难。

在这里，to do sth. 是真实的主语，it是个形式主语，所以在翻译时要把真实的主语放前面来，it不要翻译

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