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《Grammar and usage(1)： Auxiliary verbs》优质课PPT课件下载
Step I The definition
助动词（Auxiliary Verbs）一般没有独立的实际意义，不能单独作谓语，必须和其他实义动词一起构成谓语，表示时态、语态和语气等。常见的助动词有 be, do, have ，情态动词和助动词短语。
Step2【阅读判断】
1). The kid doesn't like swimming. ___
2). The student does sports every day. ___
3). He has a lot of homework to do today. ___
4). He has finished his homework. ___ 5). The story is scary. ___
6). I am speaking against the Internet. ___
√
×
√
√
×
×
Step 3 【观察思考】
Task 1
1). I am studying in No.4 middle school now.
2). We are crossing the Garden Bridge now.
3). Is he reading the book now?
4). Aspirin was invented in 1897.
5). The students were not studying when the teacher came into the classroom.
be 作为助动词时, 有
等各种形式；
主要用于构成 和
am、is、are 、