【基础篇】句子种类（陈述句）
陈述句
Declarative Sentence
英语的句子种类共分为四种：
陈述句（肯定句和否定句）疑问句（一般疑问句和特殊疑问句）、祈使句、感叹句
陈述句的概念
陈述句是陈述一个事实或者说话人的看法。它包括肯定句和否定句两种。（这个看法没有疑问色彩）
| There is a dog. |
| I like dogs.（陈述我喜欢狗这个事情） |
| There is a cat. |
| I don’t like cat.（陈述我不喜欢猫这个事情） |
陈述句-肯定句
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He is a good teacher. (be动词)
他是一名好老师。
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She will go shopping. (助动词)
她回去购物的。
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LI Ming’s father can swim. (情态动词）
李明的父亲会游泳。
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2️⃣只有行为动词的句子，表示实在意义的动词
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I like apples. 我喜欢苹果。 |
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They play basketball after school everyday. 他们每天放学后都要打篮球。 |
肯定句改否定句
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She is my sister. 她是我的妹妹。 |
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She is not my sister. 她不是我的妹妹。 |
❓思考❓be动词的过去式怎么变否定句呢？
在 was，were后面加not
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I was not a football player 10 years ago |
2️⃣句中有情态动词的，直接在情态动词后面加not
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She can jump high. 她可以跳得很高的。 |
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She can not jump high. 她不可以跳得很高。 |
can/could（能够） must（必须） should（应该） may（可能）
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She studies English at school She does not study English at school. |
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I like this movie. I don’t like this movie. |
❓思考❓如果是过去时，否定句怎么变呢
用did代替do和does，再加not，即didn’t+动词原形
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She went to school by bus yesterday. She didn’t go to school by bus yesterday. |
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改：He is not a good teacher. |
| She works at school. (实义动词) 改：She doesn’t works at school. |
| Li Ming’s father can drive the car. (情态动词) 改：Li Ming’s father can not drive the car. |
| You can come in .(情态动词) 改：You can not come in . |
| It will rain tomorrow.(助动词) 改：It will not rain tomorrow. |