初中英语动词时态讲解ppt课件

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系动词
1. 我们所学过的系动词是
1) Get，turn，be come，be动词 2) 感观动词look，sound，smell，taste，feel
2. 系动词只和形容词连用，构成系表结构
1) I feel hungry. 2) The day gets longer and longer. 3) He looked happy.
注意：请根据时态和句中的名词选择适当形式。
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be动词的用法
3. Be 动词在时态中的运用
1) 在现在进行时中
We are talking.
2) 在过去进行时中
We were talking at this time yesterday.
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助动词
助动词的几种形式
1) do /don’t 2) Does/ doesn’t 3) Did/ didn’t 4) will /won’t 5) have haven’t /has hasn’t/had hadn’t
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情态动词
1. 共同特点
1) 情态动词后面跟动词原型 2) 无论否定、疑问、倒装句、或反意疑问句都用情
态动词 3) 只有时态变化，没有人称变化
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情态动词
2. 解释
1) 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。 I can swim. I could swim at the age of five.
I don’t have to carry the big box. He had to wash his clothes.
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情态动词
2. 解释
3) May
表示请求别人允许。 May I use your bike? 表示可能性。 He may be a teacher. He may live in this building.
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实义动词
1. 实义动词指的是有具体行为意思的动词。 2. 实义动词在句中可以做谓语动词和非谓语
动词。 3. 做谓语动词的用法
动词会有四种形式：单三，现在分词，过 去式，过去分词
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实义动词
注意：掌握四种形式的变化规律 1) He works in the office. 2) We are dancing together. 3) I caught a cold last week. 4) She has watered the flower.
2) 用于复数名词之前 There are some sheep in the hill.
3) 用于一般将来时 There is going to be a film in our school next Sunday.
4) 用于一般过去时 There was a book on the desk yesterday.
2. 在反意疑问句中
1) He works in a school, doesn’t he? 2) She has never been there,has she?
3. 在倒装句中
1) They helped the farmers , so did we. 2) I won’t visit the famous singer,neither will he.15Fra bibliotek实义动词
4. 做非谓语动词的用法（指出现在谓语动词 之后的动词，它受前面谓语动词的限制） 动词会有三种形式：
1) 原型(do) 2) 动名词(doing) 3) 不定式(to do)
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实义动词
1) 用原型：
a) let sb.do b) make sb.do c) help sb.(to)do d) had better do
初中英语动词时态讲解 Fun With English!
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动词的构成
1. be 动词 2. 助动词 3. 情态动词 4. 系动词 5. 实义动词
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be 动词
be动词的几种形式
1) am is are 2) was were 3) being 4) Been
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be动词的用法
1. 与名词、数词、形容词、介词连用
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实义动词
2) 用动名词：
a) like doing b) enjoy doing c) finish doing d) 介词之后用动名词
be good at doing what about doing thank you for doing
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实义动词
3) 用不定式：
a) want to do b) decide to do c) plan to do d) would like to do e) learn to do f) tell sb.( not)to do g) ask sb.(not) to do
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情态动词
2. 解释
2) Must /have to Must 表示主观意愿，否定句用Mustn’t，否定回答用 needn’t I must go now. You mustn’t play in the street. Must I clean the room now? No,you needn’t. have to表示客观条件的限制的“不得不”，它有时态 和人称变化，需要助动词来否定和疑问。
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助动词的用法
1. 对句子进行否定和疑问
1) Do you get up early every day? 2) I didn’t have lunch yesterday. 3) Will you be back soon? 4) He hasn’t finished the work yet.
1) I am a doctor. 2) He is ten. 3) They are tired. 4) The cat is under the table.
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be动词的用法
2. There be 句型
1) 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.