10.must /have to

must多表示主观需要或责任感的驱使有必要或有义务去做某事，多译为“必须”，

have to多表示客观存在的环境所限,即客观要求(无奈)而为之，多译为“不得不干某事”。

I must clean the room because there are too dirty.

I have to do my homework now.

11. It takes sb some money/time to do sth.花费某人多少时间/钱做某事

Sb pay some money for sth 某人为某物花费多少钱

Sb spend some time/money on sth 某人在做某事或某物上花费时间/钱

Sb spend some time/ money (in)doing sth

Sth cost sb some money 某物花费某人多少钱

二、 短语归纳

1.get to school 到校   2.take the subway 乘地铁

3.take the train 坐火车   4.leave for 到……地方去，离开去某地

5.take…to…把……带到…… 6. most students 大多数学生

7. depend on 依赖，决定于  8.from…to…从……到……

9.think of 想到，想起       10.ride bikes 骑自行车

11.in other parts of the world 在世界的其他地方   12. how far 多远

13.take the train to school 乘火车去上学   14.in places 在一些地方

15.go to school by boat乘船去上学 1  6.on the school bus乘坐校车

17.be different from和……不同    18.worry about 担忧，焦虑，担心

三、语法专项

how 引导的特殊疑问句

1.how 引导的特殊疑问句提问交通方式，其答语分三种情况：

a. take a/an/the+交通工具(单数)

take +a/an/the+表示交通工具的名词，乘……去某地。

He takes the train.

b. by+交通工具(单数)

c. on/in+限定词+交通工具

by+表示交通工具的单数名词或on/in+ a/an/the/one’s+表示交通工具的单数名词，是介词短语作方式状语。

I get to school by bike. = I get to school on my bike.

3.walk/ride/drive/fly+to+地点名词，步行/骑自行车/开车/坐飞机去某地

表示乘交通工具方式可以互换表达相同的意义:

Take the bus to school=go to school by bus=go to school on a bus

Drive a car to work=go to work by car=go to work in a car

Fly to shanghai=go to shanghai by plane/air=take the/a plane to shanghai=go to shanghai on a/an/the plane.