4. This school begins classes at 7:45.

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【知识要点】

1. take ，by

take v. 1) 乘,坐,搭(车船,等交通工具) My brother takes the subway to work.

2) 花费(时间) It takes(took) sb. Some time to do sth.

It takes him an hour to go to work everyday.

by prep. 以...方式 by bus; by plan; by air

2. leave for 动身去（某地）

"leave+地点名词"表示"离开某地" When did you leave Beijing? 你什么时候离开北京？

"leave for +地点名词"表示"去某地" He is leaving for London next Sunday.下星期他要动身去伦敦。

"leave A for B"表示"离开A去B地"例如：They won't leave Hefei for Shanghai.他们不会离开合肥去上海。

典型例题：

1. -How does he go to work?

-He ______ the train.

A. take B. takes C. by D. on

　解析：此题缺少谓语动词，因而排除C.D两项，因为介词不能做谓语。主语He是第三人称单数，动词也应用单三形式。因而选B.

2._____ is it from Beijing to Shanghai?

A. How many B. How long C. How much D. How far