初中英语语法——动词(共33张PPT)

动词 take medicine drink water run skate 什么叫动词？ 动词的定义：动词是表示动作或状态的词。 动词的分类： 1.助动词 2.情态动词 3.系动词 4.实义动词 be动词的用法 与名词、数词、形容词、介词连用 I am a doctor. He is ten. They are tired. The cat is under the table. There be 句型 用于不可数名词和可数名词单数之前 There is a pen on the desk. There is some water in the glass. 用于复数名词之前 There are some sheep in the hill. 用于一般将来时 There is going to be a film in our school next Sunday. 用于一般过去时 There was a book on the desk yesterday. There used to be (过去常)a tall tree here. 对句子进行否定和疑问 Do you get up early every day? I didn't have lunch yesterday. Will you be back soon? He hasn't finished the work yet. 在反意疑问句中 He works in a school, doesn't he? She has never been there, has she? 助动词的用法 3. 在倒装句中 They helped the farmers , so did we. I won't visit the famous singer,neither will he. 情态动词 1.共同特点 a.情态动词后面跟动词原形 b.无论否定、疑问、倒装句、或反意疑问句都用情态动词 c.只有时态变化，没有人称变化 解释 can / could 在表示请求允许的时候两者和互换， could比can语气更委婉。 Can I help you? Could you open the window? 在表示有能力作某事时，could是can的过去式