Ⅰ. no “不”既可作形容词,又可作副词。作形容词时用来否定名词、代词或动名词。作副词时,主要用于否定回答。
① The poor boy had no money for books. 那个穷孩子没钱买书。
② No smoking. 禁止吸烟。
③ Isn’t he a teacher? No, he isn’t.
Ⅱ. not “不”只用作副词。用来否定动词、不定式、形容词或副词。通常放在“三类词”(情态动词,助动词,系动词)之后,行为动词之前。否定不定式时,直接放在不定式的小品词to前。如:
① I have not been to Beijing.
② He doesn’t like reading.
▲ no 和not 都可与形容词或副词的比较级连用,但句子的含义不同。如:
① I am no taller than he. 我不比他高。(两人都矮)
② I am not taller than he. 我不比他更高。(两人都高)
▲ no = not a 或not any 如:
① She has no books = She doesn’t have a book. = She does not have any books.
▲ no 表示它所修饰的名词的相反的意思。而not只能表示一般的否定。如:
① He is no teacher. 他根本(绝)不是老师。(不善于教书)
② He is not a teacher. 他不是老师。(可能是其它职业)
③ He is no fool = He is clever. 他不笨(他是聪明的)
④ He is not a fool. 他不是个傻子。
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