5. the population of+地点+ is +数词

=某地+ has a population of +数词

4.explain sth to sb 解释某物给某人

　 explain sth

　 explain+疑问副词+ to do

　 explain+从句

3.go on doing sth继续做某事(同一件事情)

go on to do sth 继续做(另外一件)事情

　 go on with sth 继续进行某事

1.start to do sth = start doing sth 开始做某事

her…nor… 既不……也不……

　either…or…　 或者……或者……

4.encourage sb to do sth 鼓励某人做某事

Unit 9

3. perfer to do sth rather than (to) do sth

　 perfer doing sth rather than doing sth

　 would rather…than… 宁愿……而不愿……

2. get sth for sb = get sb sth

(同样的用法有：make, cook, play, buy, pour)

1. not…enough to do sth 不够……去做某事

　 too…to do sth　 太……而不能去做某事

　 so…that…　 如此……以致……

6. 花费的表达方式：　 (in) doing sth

sb spend + 钱/ 时　 on sth

　　　　　　　　　　 with sb

　　　　　　　　　　 介词+ sw

　 It takes +钱/ 时 to do sth

　 Sb pay +钱 for sth

　 Sth cost sb +钱

Unit 8

5. take care (not) to do sth　 小心(不)做某事