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一般过去时改否定句再改一般疑问句,我这有两例子;he worked vevy hard last year和MR.smi

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一般过去时改否定句再改一般疑问句,我这有两例子;he worked vevy hard last year和MR.smith bought a ne
car yesterday.
he worked vevy hard last year.
否定 he didn't work vevy hard last year.
疑问 did he work vevy hard last year?
MR.smith bought a new car yesterday.
否定 MR.smith didn't buy a new car yesterday.
疑问 did MR.smith buy a new car yesterday?