原文有系动词be的用be+not
原文谓语是实意动词的变否定是借助助动词do+not
如果原文是一般现在时,且主语是第一二人称或第三人称复数时,用do+not;
如果原文是一般现在时,且主语是第三人称单数时,用does+not;
如果原文是过去时,统一用did+not.
实义动词用don't
be动词用 not
例如:i don't know. i don't like it
i am not a slacker.
一些感官动词,watch,see,listen, smell 等等 就借助情态动词来表达否定,
i can't smell. i can't watch.
当句中含有be,情态动词时,变否定句直接在它们的后面加not,
I'm not your teacher
I can not swim
而当句中含有实义动词时,变否定句要根据主语在主语后面加don't 或doesn't
I don't speak English
He doesn't like watching movies.
除了be以外的动词..用dont
be not