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我三年前是很瘦的Last three years,I was very thin.否定句:Last three years,I wasn‘t very thin.希望可以帮助您
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I was very thin three years ago. 我三年前是很瘦的。---否定句:I was not very thin three years ago. 我三年前不是很瘦的。---引申:肯定句变否定句的基本方法一、如果谓语中有情态动词、助动词或be,直接在它们后面加not构成否定句。I can not dance. 我不会跳舞。He will not go there. 他不会那里。I am not a teacher. 我不是教师。注意:若谓语中不止一个助动词、情态动词或be时,在第一个后加not。如:He has not been to Japan. 他没有去过日本。二、如果谓语中没有情态动词、助动词或be,在动词之前加do not (一般现在时第三人称单数用does not,过去时用 did not,并将原来的谓语动词改为原形) 。You don’t look well today. 你今天气色不好。She does not know what to do. 她不知道做什么。I didn’t do morning exercises today. 我今天没做早操。注:have做助动词时,在后面加not;作“有”解时也可以在后面加not;不是作“有”解的为行为动词时,其否定式和其他行为动词一样要在前面加do(does、did) not。如(www.yygrammar.com):I haven’t finished my homework. 我还没有做完作业。I have not (=don’t have) a car. 我没有汽车。I don’t have lunch at school. 我不是在学校吃中饭的。She doesn’t have lunch at school. 她不是在学校吃中饭的。He didn’t have lunch yesterday. 他昨天没有吃中饭。