1. 不规则动词的过去式:例如,go-went,eat-ate,see-saw等。
2. 一般动词的过去式:在动词原形后加-ed,例如,walk-walked,talk-talked,look-looked等。
3. 动词变化规则:例如,当动词以辅音字母+y结尾时,将y改为i再加-ed,例如,study-studied,carry-carried等。
4. be动词的过去式:was和were。例如,I was happy,They were tired。
5. 动词的过去式形式和用法:过去式通常用来表示过去发生的事情,例如,I walked to school yesterday。
6. 动词的过去式否定形式:在动词前加didn't,例如,I didn't go to the park yesterday。
7. 动词的过去式疑问形式:将动词提到句首,并加did,例如,Did you watch TV last night?