ملخص الدرس / الثالثة ثانوي/اللغة الإنجليزية/Grammar/If-conditional

the conditional

If is a conjunction which introduces a condition (something which may or may not happend depending circumstances).

there are four mainkinds of condition.

if-conditional :type zero

form: if+.....present simple.....,.....present simple....


this type of condition has the present simple in both clauses,and means that the conditional can be true at any time .in this type of condition,if can be replaced by when or whenever.

if , when, whenever you heat water at 100 degrees celsius, it boils .

water boils if , when, whenever you heat at 100 degrees celsius.


when if means if it is true that, the present simple does not describe some thing true at any time or a  general habit. so when can not replace if.

if= if it's true that when you take this medecine, you will soon fell better . 


if-conditional type one:


if+....present simple ...,....,will (or'll)will not (or won't).

if I SEE Abedelkaderm Iwill invite him to the party.

We'll go to the beach tomorrow if it sunny.


We use the first conditional to talk about thingsthat are possible in the future.it's possible that it will be sunny .so likely result  we'll go to the beach tomorrow.

note:we do not use willin the if clause, even though it refers to the future.

if I will pass my brevet, I'will celebrate. 

future possibility result
if it's sunny we'll go to the beach


if-conditional type2


if....+past simple...,+would (or 'd).

if Iwere you ,Iwould apologise.

if the Martians invadedour planet one day,they'd kill us all.


we use the second conditional to talk about the present, and to imagine something totally different from the real situation now or in the future.

in sentence a,the speaker is just imagining  himself/herself that he is me.but he can't really be me.

in sentence bthe speaker is just imagining that one day the Martians will invade our plante. but we know well that Martians do not exist.

Note: you can use were for alls forms of be  in the if clause of the second conditional.

if she/he /karim was /were rich,he/she would travelto Australia.  


if -conditional type 3:


if +......past perfect...,.....'d/would  have .....+past participle......


if I had been a littel bit taller,I'd/would have joined the Army.

I'd/would have joined the Army if I had been a littel bit taller.

We use type 3 conditional when we imagine a different past,i.e,an nureal past. in the example above, the speaker was not tall enough.so he could not join the Army.


Other formsand usesof the conditional:

if+present simple,     imperative       .

if you're happy,  clap your hands.


if +present +modal+verb

if you fall, you can/may hurt yourself.

if it fails to start ,you should/must check the battery.


if +past simple+might/could+ verb 

if Martians invaded our plane, they could exterminate us.

types of conditionals:

We have four types of conditionals:

Type zero: T0

If + Verb in present simple, Verb in present simple.

Eg: If you heat water, it boils.

T0 is used to describe a general or scientific.

Type  one: T1

If + Verb in present simple, verb in future (will + stem)

Eg: If she works hard, she will go to university.

The situation in T1 is possible to happen.

Type two: T2

If + Verb in past simple, would + stem

Eg: If I were you, I would buy a car.

The situation in T2 is impossible to happen (an imaginary situation).

Type three: T

If + Verb in past perfect, would have + past participle

Eg: If I had read the question well, I would have taken the best mark.

The situation in T3 is a regret about an event that had happened in the past.