练习材料：Lesson 16 A polite request
If you park your car in the wrong place, a traffic policeman will soon find it. You will be very lucky if he lets you go without a ticket. However, this does not always happen.Traffic police are sometimes very polite. During a holiday in Sweden, I found this note on my car: 'sir, we welcome you to our city. This is a "No Parking" area. You will enjoy your stay here if you pay attention to our street signs. This note is only a reminder.' If you receive a request like this, you cannot fail to obey it!
任务配置：L0+L4
知识笔记：
条件句（Conditional sentences）
（1）条件指某一事情完成之后其他事情才能发生。if通常的意思是“假如”，其后有时跟then（那么）。if引导的条件从句指能够发生、可能发生或可能发生过的事件。如果我们认为将来的事件很可能会发生，那么if从句中要用一般现在时（有时也用其他形式的现在时），主句中用will（或shall）加动词形式或其他形式的将来时：
（2）主句中的will表示肯定如此或几乎可以肯定会如此。如果觉得其“肯定”程度达不到使用will的程度，或者如果想表达建议等其他意思，就可以用别的情态助动词来代替will：If it's fine tomorrow, we can/may go out.
（3）主句还可以用祈使语气等表示请求、建议等：
Stay at home tomorrow if it rains.
明天如果下雨就呆在家里。
Please tell him to ring me if you see him.
如果你见到他，请让他给我打电话。
Please let me know if you can't come.
如果你不能来，请告诉我一声
练习感悟：断了9天，重新开捡。看了king之咘
的21天阶段小结，感慨做同样的事，不同的付出产生不同的结果。
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