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单元清
祈使句
1．祈使句的定义。
用于表达命令、请求、劝告、警告、禁止等的句子叫作祈使句。
2．祈使句的用法。
肯定祈使句以动词原形开头。祈使句的动词都为一般现在时，句末则使用句号或感叹号来表示结束。
【注意】祈使句因对象(即主语)是第二人称，所以通常都省略主语。
3．祈使句句型结构。
(1)肯定结构：
①Do型[即：动词原形(＋宾语)＋其他成分]
Please have a seat here.请这边坐。
②Be型[即：Be＋表语(名词或形容词)＋其他成分]
Be a good kid！要做一个好孩子！
③Let型(即：let＋宾语＋动词原形＋其他成分)
Let me help you.让我来帮你。
(2)否定结构：
①Do型和Be型的否定式都是在句首加don't。
Don't be late for school！上学不要迟到！
②Let型的否定式有两种：Don't let＋宾语＋动词原形＋其他成分；Let＋宾语＋not＋动词原形＋其他成分。
Don't let him go./Let him not go.别让他走。
◆写作案例
假如你是Tom，请根据邮件内容及所给信息，给王刚回一封电子邮件。
Dear Tom，
How are you?
I'm writing to ask you something about cooking.My good friends want to spend this weekend with me.I want to make fruit salad for them.But I don't know how to make it well.Can you help me？Please tell me what I need and what I should do.
I hope to hear from you as soon as possible.
Yours，
Wang Gang
原料：四根香蕉，三个苹果，半个西瓜，或者其他水果，蜂蜜，奶酪。
步骤：全部切碎放在碗里面；加蜂蜜和奶酪；搅拌均匀。
◆思路点拨
这是一篇关于物品的制作流程的文章。我们在写作时，先写原料和设备；再写制作流程，写流程可运用表示步骤的first，next，then与finally等词汇；最后写出评价和总结。
◆高分模板
引出话题：want to make fruit salad，need four bananas，three apples，and a half watermelon...
制作好后的感受：...enjoy it with your friends.
◆美文欣赏
Dear Wang Gang，
I'm glad to hear from you.You want to make fruit salad.You need four bananas，three apples and a half watermelon or other fruits，and you also need some honey and yogurt.
First，wash and cut up all the fruits，and put them into a bowl.Next，add two spoons of honey and a cup of yogurt to the fruit.Then，mix up everything.Finally，serve the fruit salad and enjoy it with your friends.
I hope it's helpful to you.
Yours，
Tom
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