(过去式我昨天走路上学。
妈妈每天上超巿。)
(过去式妈妈昨天早上上超巿。) ※主词为第三人称单数时，过去式动词不须加s
※含有一般动词(过去式)的肯定句变为否定句时，不可直接在一般动词之后加not，必须使用过去式助动词did(不分人称)。而did之后，必定出现原形动词。
肯定句：主词+一般动词(过去式) 否定句：主词+did not+原形动词
例：l. He called you last night. (他昨晚打电话给你。)
(否定句) He did not call you last night. (他昨晚没打电话给你。) = He didn’t call you last night.
2. My sister and I watched TV all day yesterday. (我姊姊昨天和我看了一整天的电视。) (否定句) My sister and I did not watch TV all day yesterday.
= My sister and I didn't watch TV all day yesterday. (我姊姊昨天和我并没有整天看电视。)
比较：否定句(过去式)
a. be动词： She was at home. (她在家。)
She wasn't at home. （她不在家。）
b. 一般动词： She studied English. (她学英语。)
She didn't study English. (她没学英语。)
一般动词(过去式)的疑问句
※含有一般动词(过去式)的肯定句变为疑问句时，不可将一般动词拿到主词前，必须使用过去式助动词did。而did之后，必定出现原形动词。
肯定句：主词+一般动词(过去式) 疑问句：Did+主词+原形动词...?
例：1. His friends went to that movie last week. (他的朋友上星期去看了那部电影。) (疑问句) Did his friends go to that movie last week? (他的朋友上星期看了那部电影吗？) (答句) Yes, they did. / No, they didn't.
(是的，他们看了。/ 不，他们没看。)
2. Grace wrote a letter to David. (Grace写了一封信给David。) (疑问句) Did Grace write a letter to David? (Grace写信给David了吗？) (答句) Yes, she did. / No, she didn't.
(是，她写了。/ 没，她没有。)
比较：疑问句(过去式)
a. be动词： He was sick. (他病了。)
Was he sick? (他病了吗？)
b. 一般动词： He did his homework. (他做功课了。)
Did he do his homework? (他做功课了吗？)
Unit 4
代名词
人称代名词