Conditionals

The conditionals are also called the “if clauses”, is very common to use them without noticed it, however is very important to know the correct grammar about it:

The Zero Conditional:

(if + present simple, ... present simple)

The First Conditional:

(if + present simple, ... will + infinitive)

The Second Conditional:

(if + past simple, ... would + infinitive)

The Third Conditional

(if + past perfect, ... would + have + past participle)

Examples:

Present Real Conditional	Present Unreal Conditional
If I have time, I study English. Sometimes I have time.	If I had time, I would study English. I don't have time.
Past Real Conditional	Past Unreal Conditional
If I had time, I studied English. Sometimes I had time.	If I had had time, I would have studied English. I didn't have time.
Future Real Conditional	Future Unreal Conditional
If I have time, I will study English. If I have time, I am going to study English. I don't know if I will have time or not. Other forms possible.	If I had time, I would study English. I won't have time. Other forms possible.

I would like to finish with the following song, I think that this song uses conditionals:

SIMPLY RED, If You Don't Know Me By Now

If you don't know me by now

You will never never never know me

All the things

That we've been through

You should understand me

Like I understand you

Now girl I know the difference

Between right and wrong

I ain't gonna do nothing

To break up our happy home

Don't get so excited

When I come home

A little late at night

Cos we only act like children

When we argue fuss and fight

If you don't know me by now

You will never never never know me

We've all got our

Own funny moods

I've got mine,

Woman you've got yours too

Just trust in me like I trust in you

As long as we've been together

It should be so easy to do

Just get yourself together

Or we might as well say goodbye

What good is a love affair

When you can't see eye to eye

If you don't know me by now

You will never

Never never know me