［正］ I want to change my camera for that one.

［析］ change for为"以某物为交换物"。而change with则是"随……而变"，如：The

wood's colour changed with the season.

cheap

［误］

A teacher's salary is generally very cheap.

［正］ A teacher's salary is generally very low.

［析］ 工资的高低要用low，cheap是指价格便宜，如果要讲物美价廉则要用not expensive, 如：This car is not expensive.

choose

［误］

We each had to have a choose of A or B.

［正］

We each had to have a choice of A or B.

［析］ choice是名词，而choose是动词。

class

［误］ The class is watching TV.

［正］ The class are watching TV.

［析］ class作主语时，如果作为整体讲则应用单数形式的谓语动词，如：The class was more than forty in number. 如考虑到具体的每个成员时则应用复数形式的谓语动词，如：

The class are, in general, very bright.

clean

［误］ Sorry, I didn't bought it here. I cleanly forgot.

［正］

Sorry, I didn't bought it here. I clean forgot.

［析］ clean可以作为副词讲，其意为"完全"，而cleanly则意为"正确地"、"干净利落地"，如：The knife doesn't cut cleanly. 而clean作为形容词讲时意为"清洁的"、"干净的"，如：

Her face is not clean now.

clever

［误］ I'm not clever in English.