If…sentences

Chapter six

Adverbial clause of condition

条件状语从句

Henry: I can’t fly it.Carol: If you put on another wing, it will fly.

Pair work:Carol is giving advice to Henry. If you were Carol

and Henry, what should you say to each other?

I feel cold. I am so hot.

I can’t see clearly.The meat will go bad.

1. If I pass my exams, I’ll leave school.2. If I leave school, I’ll get a job.3. If I get a job, I’ll work as a ________.4. If I work as a ________, ________.5. If I ________, ________.6. If I ________, ________.7. If I ________, ________.8. If I ________, ________.

If sentences

(1) If sb does sth, sb will do sth

= sb will do sth if sb does sth

主句（将来时）

从句（一般现在时）

A： actions having results that will probably happen

主语的行为将导致某种可能发生的结果时

主将从现

If sentences

(1) If sb does sth, sb will do sth

= sb will do sth if sb does sth

主句（将来时）

从句（一般现在时）

A： actions having results that will probably happen

(2)主句为祈使句或情态动词形式If sb does sth, please do sth

If sb does sth, sb may(情态动词 ) do sth

Exercises: change the following sentences into if sentences

returns call

buypasses

1. If she ______(return) from Paris, please ____(call) me.

2. If my husband ______ (pass) the test ， we may____ (buy) a car.

Exercises: change the following sentences into if sentences

3.Get up early, not be late

4.Take a fish out of water, die

5.Heat metal, melt

If you get up early, you won’t be late .

If you heat metal, it melts

returns call

buypasses

1. If she ______(return) from Paris, please ____(call) me.

2. If he ______ (pass) the test ， we may____ (buy) a car.

If you take a fish out of water, it dies.

If sentences

If sb does sth, sb/sth does sth

= sb/sth do sth if sb does sth

主句（一般现在时）

从句（一般现在时）

B： actions having results that will certainly happen

相当于 when从句

Can ‘if’ be replaced by other words?

主语的行为将导致某种必然发生的结果时

Exercises: change the following sentences into if sentences

3.Get up early, not be late

4.Take a fish out of water, die

5.Heat metal, melt

If you get up early, you won’t be late .

If you heat metal, it melts

returns call

buypasses

1. If she ______(return) from Paris, please ____(call) me.

2. If he ______ (pass) the test ， we may____ (buy) a car.

If you take a fish out of water, it dies.

条件状语丛句只有 if…sentenses 一种吗？

C ： Unless ： sb will do sth unless sb does sth

if sb does not do sth

Eg: You will be late for school you now.

You will be late for school you now.

unless leave

don’t leaveif

Unless sentences exercises

1. have toothache, clean your teeth regularly

2. get very hot, put the air-conditioner on soon

Unless you clean your teeth regularly, you will have toothache

If you don’t clean your teeth regularly, you will have toothache

Unless you put the air-conditioner on soon , you will get very hot.

If you don’t put the air-conditioner on soon , you will get very hot.

More practice1.If you ______ drop a glass, it ______ (break).2.He ______ (fail) in the exam if he ______ (not study) h

ard.3.Unless you ______ (leave) now, you ______(be) late.4.We ______ (have) a barbecue unless it ______ (rain) .5.If you ____ (cool) water, it _____(turn) into ice.6.Hurry up, or you will miss the bus. ___ you don’t hurry up, you ____ catch the early bus.7.Study hard, or you’ll miss fall behind. ______ you study hard, you______ fall behind.8.If you don’t put on your scarf, you’ll catch cold. Put on your scarf, _____ you’ll catch cold.9.The insurance company would pay him 2 million yuan if the v

ase was stolen. The insurance company _____ pay him 2 million yuan _____ t

he vase was stolen.10.I don’t know if it_______ tomorrow. If it ____ ,Iwon’t go sho

pping. (rain)

drop breaks

will fail doesn’t study

leave will bewill have rains

cool turns

If won’t

unless will

or

won’t unless

will rain rains