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练习 1.be(am/is/are/was/were)
(1)构成进行时态
我现在正在加拿大学习。I am studying in Canada now.
(2)构成被动语态
玻璃是被安妮打碎的。The glass was broken by Annie.
(3)构成系表结构
她很漂亮。She is beautiful. 2. have/has/had
构成完成时态
我们相互认识多年了。We have known each other for years. 类别
要点
练习 3. do/does/did
(1)构成疑问句、否定句
①你喜欢音乐吗?Do you love music?②我不知道你要来。I didn’t know you were coming.
(2)加强语气
她的确喜欢流行音乐。She does
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