=The twin brothers don't go to school by bus. (这对双胞胎兄弟不搭公交车上学。) 2. Sam has dinner at the restaurant. (Sam在那家餐厅吃晚餐。) (否定句) Sam does not have dinner at the restaurant.
不在那家餐厅吃晚餐。)
※比较→否定句
a. be动词： He is my boyfriend. (他是我男朋友。)
He isn't my boyfriend. (他不是我男朋友。)
b. 一般动词： He likes dogs. (他喜欢狗。)
He doesn't like dogs. (他不喜欢狗。)
一般动词的疑问句
※含有一般动词的肯定句变为疑问句时，不可将一般动词拿到主词前，必须使用助动词do或does。而do或does之后，必定出现原形动词。
肯定句：主词+一般动词
疑问句：Do/Does+主词+原形动词 ？
例：l. You visit your grandmother on Sundays. (你每逢假日探访你祖母。)
(疑问句) Do you visit your grandmother on Sundays? (你每逢星期日探访你祖母吗？)
2. He comes from England. (他来自英国。)
(疑问句) Does he come from England? (他来自英国吗？)
※助动词do或does开头的疑问句，Yes或No之后，也须用do或does做简答。
(问句) Do / Does+主词+原形动词 ？ (答句) Yes, 主词+do/does.
No, 主词+don't/doesn't.
例：Does the little boy go to school? (这小男孩上学了吗？) (答句) Yes, he does. / No, he doesn't.
(是，他是。/ 不，没有。)
※比较→疑问句
a. be动词： She is beautiful. (她是美丽的。)
Is she beautiful? Yes, she is.
(她美丽吗？) (是的，她是。)
b.一般动词： She loves tennis. (她喜欢网球。)
Does she love tennis? Yes, she does. (她喜欢网球吗？) (是，她喜欢。)
Unit 3 be动词·一般动词的过去式
be动词的过去式
1. (现在式他现在很忙。）
(过去式他那时很忙。)
2. (现在式我父母现在在家。)
(过去式我父母昨天在家。)