式：
用系词：
He was sick yesterday
否定句：面直接加not, He was not sick yesterday.
疑问句：系词提前 Was he sick yesterday?
般式词
He watched TV last night
否定句：都加 didn't 词变现态 He didn't watch the TV last night.
疑问句：Did放句前面原句词式变现：Did he watch TV last night?
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