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English Classes

River Thames

Thames – Isle of Dogs

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If CLAUSES

River Thames

Thames – Isle of Dogs

CONDITIONAL SENTENCES

If human beings go on modifying the environmental cycles they will stop the ability of ecosystem to provide benefits to humans.

CONDITIONAL SENTENCES

Gases in the atmosphere keep the sun's heat in and help make our planet livable. If we stopped this natural insulation, the Earth's surface would be much colder than it is now.

CONDITIONAL SENTENCES

We would have found more trees like this every where if we had used common sense.

The Greenhouse Effect wouldn’t have become a big problem if we had not cut down so many trees.

Look what we've done!!!

Society's Impact On Our Environment

There are There are three types of conditionals. of conditionals.Each type consists of two parts:Each type consists of two parts:

the the if -clauseif -clause (hypothesis), which begins with (hypothesis), which begins with the wordthe word if. if.

and the and the main clausemain clause, which shows the result of , which shows the result of the the hypothesishypothesis..

if - clause main clauseif - clause main clause (hypothesis) (result)(hypothesis) (result)

If we changeIf we change our habits , we our habits , we will savewill save our planet. our planet.

When the When the if-clauseif-clause comes comes beforebefore the main the main clause, they are separated with clause, they are separated with a commaa comma. .

IF we didn't cut them down, trees like these would be almost every where

When When the main clausethe main clause comes comes beforebefore the theif-clause, then if-clause, then they are not separatedthey are not separated with a with a comma.comma.

Trees like these would be almost every where if we didn't cut them down

Type 1

Oração Condicional Oração Principal

Simple Present Simple Future

If we use less energy , we will help the greenhouse effect getting worse.

If you don’t know what the Greenhouse Effect may cause,

read about it and you’ll find out.

TYPE 1- Conditionals

If we use less energy we will help the greenhouse effect getting worse.

Type 1 conditionals can also be formed as follows:

If - clause Main Clause

If + Simple Present Simple Present

Imperative

Can / must / may ...

+ bare infinitive

If + If + Simple Present Present Simple PresentSimple Present++

If you think our radiation is low, you're wrong!

If + Simple Present Imperative+

If you want to find out how to help our planet, click below on the link "Ways You Can Help."

If + Simple Present Modal Verb+

If we carry on polluting the atmosphere with greenhouse gases, it can cause very dangerous effects on the Earth.

Type 2

If Clause Main Clause

Simple Past Simple Conditional

would + infinitivo (- to)

If the temperature became higher,

the water of the seas and oceans would expand.

If I were you, I would become a “Healthy planet member”.

TYPE 2- ConditionalsTYPE 2- Conditionals

Grass like this would be everywhere if we did not make so many roads and houses.

If each of us saved just one can a day from landfill - that would add up to hundreds of millions of cans - in just one day.

Type 3

If ClauseIf Clause Main ClauseMain Clause

Past PerfectPast Perfect would have + particípiowould have + particípio

If we had formulated specific policy to control human activities,

global temperature wouldn’t have increased.

IfIf we we had reducedhad reduced the the use of fossil fuels, use of fossil fuels,

we we would have reducedwould have reduced acid rain.acid rain.

If I had run the dishwasher only with a full load, we would have reduced the use of electricity.

We would have helped to protect the environment if we had used more recycled materials.

We can use We can use unlessunless instead of instead of if...notif...not in the , in the ,if -clause. The verb is always in the affirmative if -clause. The verb is always in the affirmative after unless.after unless.

lf we don't followlf we don't follow the Kyoto and Bonn treaties , , we'll havewe'll have serious environmental problems.

Unless we we followfollow the Kyoto and Bonn treaties , , we'll havewe'll have serious environmental problems.

(UNLESS = a não ser que)