一般過去時的句法結構：
1、肯定形式
主語+動詞過去式+其它
例句：She came to help us in those days．
2、否定形態
主語+didn't +謂語動詞原形+其它
1.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
①Did+主語+謂語動詞原形+其它
②Was/Were+主語+表語
例句：Did you do homework?
4、特殊疑問句
特殊疑問詞+ did+主語+動詞原形+其它？
特殊疑問詞+was/were+物主代詞/...'s+sth.？
5、被動語態
主語 + was / were + 動詞的過去分詞