21. decide to do sth. 决定做某事 如：
      LiLei has decided to go to BeiJing . 李雷已经决定去北京。
22. unless 假如不，除非 引导条件状语从句
      如：You will fail unless you work hard..假如你不努力你会失败。
      I won’t write unless he writes first. 除非他先写要不我不写
23. deal with 处理 如：I dealt with a lot of problem.
24. worry about sb./ sth. 担心某人/ 某事
      如：Mother worried about his son just now. 妈妈刚才担心他的儿子。
25. be angry with sb. 对某人生气 如：I was angry with her. 我对她生气。
26. perhaps = maybe 也许
27. go by (时间) 过去 如： Two years went by. 两年过去了。
28. see sb. / sth. doing 看见某人正在做某事 强调正在发生
      see sb. / sth. do    看见某人在做某事 如：
      如：She saw him drawing a picture in the classroom. 她看见他正在教室里画画。
29. each other 彼此
30. regard… as … 把…看作为….  如：
      The boys regarded Anna as a fool. 这些男孩把安娜看成傻瓜。
31. too many　许多　修饰可数名词　如：too many girls 
      too much　许多　修饰不可数名词 如：too much milk
      much too　太　　修饰形容词   如：much too beautiful
32. change…　into…　将…变为…　
      如：The magician changed the pen into a book. 这个魔术师将这本书变为一本书。
33. with the help of sb. = with one’s help 在某人的帮助下
      如：with the help of LiLei = with LiLei’s help 在李雷的帮助下
34. compare … to …　把…与…相比　
如：Compare you to Anna, you are lucky. 你和安娜相比，你是幸运的。
35. instead 代替　用在句末，副词（字面上常不译出来）
      instead of sth. / doing sth. 代替，而不是。用在句中。
      如：Last summer I went to Beijing. This year I’m going to Shanghai instead. 去年夏天我去北京, 今年我将要去上海。
　　I will go instead of you. 我将代替你去。
　　He stayed at home instead of going swimming. 他呆在家里而不是去游泳。