1、肯定形式:主語+動詞過去式+其他。
例句:She often came to help us in those days.
2、否定形式:
(1)was/were+not;
(2)在行為動詞前加didn't,同時還原行為動詞。例句:I didn't know you like coffee.
3、一般疑問句:
(1)Did+主語+謂語動詞原型+其他;例句:Did I do homework?
(2)Was/Were+主語+表語。
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