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1、clothes, cloth, clothing clothes统指各种衣服，谓语动词永远是复数， cloth指布，为不可数名词， clothing 服装的总称，指一件衣服用a piece of, an article of 2、incident, accident incident指小事件, accident指不幸的事故He was killed in the accident. 3、amount, number amount后接不可数名词， number后接可数名词 a number of students 4. a number of, the number of a number of许多，谓语动词用复数。the number of的数目，谓语动词用单数。The number of students is increasing. 5. in front of, in the front of in front of范围外的前面，in the front of范围内的前面 In the front of the room sits a boy. 6. of the day, of a day of the day每一天的，当时的，当代的， of a day暂时的，不长久的 a famous scientist of the day 7. who, what who指姓名或关系，what指职业或地位 What is your dad? He is a teacher. 8. what, which what的选择基础是无限制的，which在一定范围内进行选择 Which do you prefer, bananas or apples? 9. other, another other后接名词复数，another后接名词单数 other students, another student | 
