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 can-not fail to obey it!

一旦你把汽车停错了地方，交通警很快就会发现。如果他没给你罚单就放你走了，算你走运。然而，情况并不都是这样，交通警有时也很客气。有一次在瑞典度假，我发现我的车上有这样一个字条：“先生，欢迎您光临我们的城市。此处是‘禁止停车’区。如果您对我们街上的标牌稍加注意，您在此会过得很愉快的。谨此提请注意。”如果你收到这样的恳求，你是不会不遵照执行的！

Grammar

真实条件下的if从句

定义：真实条件句谈论或询问十分可能发生或实现的事情。

真实条件句的结构：If + 一般现在时，主句用一般将来时；

或If + 一般现在时，主句用情态动词。

口诀：主将从现，主情从现

Exercise

1. The volleyball match will be put off if it __________ tomorrow.

A. will rain　 B. rains　 C. rained　 D. is rained

2. I’m waiting for my friend. __________ I’ll go shopping alone.

A. If she comes             B. If she doesn’t come

C. If she will come         D. If she didn’t come

1. 解析：考查真实条件下的if从句，if从句需要使用一般现在时，故答案选B。

2. 解析：考查真实条件下的if从句，if从句需要使用一般现在时，故答案选B。