Lesson 16 A polite request

·单词

park v.    停放（汽车）

    ·parking signs    停车标志

    ·"No Parking" areas

traffic n.    交通

    ·traffic light    红绿灯

    ·traffic accident    交通事故

ticket n.    交通违规罚款单

note n.    便条

area n.    地段

sign n.    指示牌

reminder n.    提示

    ·remind v.    提醒，使想起

fail v.    无视，忘记；失败

    ·fail to do sth.    未能做某事：指在尝试完成某项任务或实现某个目标时未能成功

    ·fail to collect it    没能取走它

    ·failure n.    失败的人

obey v.    服从

    ·obey the rules    遵守规则：按照既定的规定、法律或道德标准行事

·本课句型

if条件状语从句，谁前面是if，谁是从句，另一个是主句

    ·真实条件句（假设的事情能成真）

        ·假设现在

        ·You will miss the train, if you don't hurry.    从句是现在是，主句是将来时

        ·If he is out, I will call him tomorrow.

        ·If he is working, I won't disturb him.

        ·假设过去

        ·If tall chimneys were built above sea level, the tunnel would be well-ventilated.    从句是过去时，主句是过去将来的

        ·假设将来

        ·If it will rain tomorrow, we will stay at home.    错

        ·因为是真实条件句，想假设将来，从句必须用一般现在时，英语规定

        ·If it rains tomorrow, we will stay at home.    对，假设将来

    ·虚拟条件句（假设的事情不能成真）

·课文

    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!

like this    像这样一样（like prep. 介词 像 ... 一样）

cannot fail    不能辜负（双重否定意思为肯定，cannot：不能，fail：辜负，使失望。不能使失望，不能辜负）

·知识拓展 

if条件状语从句(真实条件句) —— 假设将来

If it____(rain), I shall take an umbrella with me.

    ·rains（天下雨是有可能实现的，所以使用一般现在时）

You never____(pass) this exam if you don' t work hard.

    ·will never pass（从句是一般现在是，所以主句只能说一般将来时）

If he plays well, he____(get) into the team.

    ·will get

If he____(enjoy) concerts, why doesn' t he come with us?

    ·enjoys

状语从句

You will miss the train, if you don' t hurry.    条件状语从句

When he was driving...., he saw two thieves.    时间状语从句

I can' t go with you, because I don' t have time    原因状语从句

    ·条件状语从句和时间状语从句假设将来需要替换为一般现在时

不规则变化的动词：

原型    过去式    过去分词    动词ing

·let    let    let    letting