2019学年度外研版选修七Module 6 The World's Cultural HeritagePeriod 5 Grammar(2)--Adverbial clauses of Place, Condition and Concession

■Goal

To learn the adverbial clauses of place, condition and concession

■Procedures

Step 1: adverbial clauses of place, condition and concession

状语从句在句中作状语，修饰主句中的动词、形容词或副词等。状语从句放在主句之前时，常用逗号分开；放在主句之后，一般不用逗号。状语从句按其意义和作用可分为时间、原因、条件、让步、地点、目的、结果、方式、比较等九种。本单元主要熟悉掌握地点、条件和让步状语从句。

1.地点状语从句

1）地点状语从句常由where和wherever引导，通常可置于主句之前或之后。。

I found the books where I left them.

Make a mark where you have any questions.

We should go where(ver) we are most needed.

Where there is a will, there is a way.

Where there is water, there is life.

2）where引导的状语从句和where引导的定语从句常可转换，判断它属于哪类从句的关键是看where前面有没有被修饰的、表示地点的先行词。试比较：

Stand where you are! （状语从句）

Stand at the place where you are! （定语从句）

Bamboo grows best where it's wet and rainy. （状语从句）

Bamboo grows best in places where it's wet and rainy. （定语从句）

2.条件状语从句

条件句可分为真实条件句和非真实条件句，非真实条件句在虚拟语气中有详细表述，这里只讨论真实条件句。引导条件句常用的有if, unless, as(so) long as, in case等，when, once, suppose (that) 或supposing (that)，on condition that 也可引导表示条件的从句。条件状语从句和时间状语从句一样，表示将来要用一般现在时。例如：

The bell is rung if there is a fire.

We won't let you in unless you show your pass.

You may use my bike as/so long as you return it before Friday.

In case anything important happens, please call me up.

Turn off the switch when anything goes wrong.

Once you taste the noodles, you'll never forget their delicious flavour.

Suppose/Supposing (that) you fail again this time, what will you do?

He agreed to lend him the money on condition that he paid back three times more money in three months' time.

3.让步状语从句

1）通常由though, although, even/though引导，主句中不能用but，但可用yet。如：