助动词Do的用法
1） 构成一般疑问句，例如：
Do you want to pass the CET? 你想通过大学英语测试吗？
Did you study German? 你们学过德语吗？
2） do + not 构成否定句，例如：
I do not want to be criticized. 我不想挨批评。
He doesn't like to study. 他不想学习。
In the past, many students did not know the importance of English. 过去，好多学生不知道英语的重要性。
3) 构成否定祈使句，例如：
Don't go there. 不要去那里。
Don't be so absent-minded. 不要这么心不在焉。
说明： 构成否定祈使句只用do，不用did和does。
4） 放在动词原形前，加强该动词的语气，例如：
Do come to my birthday party. 一定来参加我的生日宴会。
I did go there. 我确实去那儿了。
I do miss you. 我确实想你。
5） 用于倒装句，例如：
Never did I hear of such a thing. 我从未听说过这样的事情。
Only when we begin our college life do we realize the importance of English.
只有在开始大学生活时我们才认识到英语的重要性。
说明： 引导此类倒装句的副词有never, seldom, rarely, little, only, so, well等。
6） 用作代动词，例如：
---- Do you like Beijing? --你喜欢北京吗？
---- Yes, I do. --是的，喜欢。（do用作代动词，代替like Beijing.）
He knows how to drive a car, doesn't he?
他知道如何开车，对吧？
Writing Instructions
Writing instructions normally tells us how to do something. Writing instructions is a skill that you should try to perfect. If your instructions are not clear, you might cause loss or damage to someone. In serious situations, the wrong instructions could lead to death.
The best way to write instructions is by using the imperative mood: this just means that you use the dictionary form of the verb to give an instruction, e.g. 'Stir slowly for two minutes'. 'Stir' is the dictionary form of the verb and is used as an instruction to do something. Here's another instruction: 'Don't add more than 250 grams of raisins to the mixture'. 'Don't add' instructs you not to add.
Try this 11-plus English quiz and see how well you do with giving instructions. Don't forget: instructions can be both written and spoken.
Find out what to do in this quiz if there is a fire.
In the given situation, which one of the instructions is correct?
