CONDITIONAL

ZERO CONDITIONAL

Structure: IF / PRESENT / PRESENT OR Imperative. You can also go backwards asthe sample three

The zero conditional is used for things that always happen. It's usually for things related to nature, phenomena

examples

If you mix blue and yellow, you get green. (if you mix blue and yellow you get green)

If you press this bottom, the TV turns on. (If you press this botoòn, television lights)

Wood floats on if you put in water (wood floats in water if you put it)

If water is heated, it boils. (if boiling water is heated)

If you drink a lot, You have hangover the next day. (if you drink too much hangover thenext day)

FIRST CONDITIONAL 

The first conditional is used to express situations based on fact in the present or future (things which may happen).

Uses the simple present tense

If + Simple Present, Will-Future

Formation:

(IF Clause)               (Main Clause)

If I see you tomorrow, I will buy you a drink.

If you don't hurry, we will miss the train. 

If I have time, I'll finish that letter.

If you don't leave,I'll call the police.

If you drop that glass, it will break.

Conditional 2

The 2nd conditional is used to express unreal situations in the present or future. Often used to express a wish.

Uses the simple past tense

If + Simple Past, Conditional (=Would +  Infinitive)

 Formation:

(IF Clause)                   (Main Clause)

If I won the lottery, I would buy a new house.

If I found her address, I would send her an invitation.

If I had a million dollars, I would buy a big house.

If I had more time, I would study German.

If she were older,  she would get the job.

THIRD CONDITIONAL 

The third type of the conditional one is in use when we speak about a condition in the past that does not exist sucedidio.

IF + Condition + Result

If + Past perfect + "Would have" + past participle

Examples:

1.If I had known then what I know now, I would have done things differently. // I would have done things differently if I had known then what I know now.

2.Suzanne wouldn't have had the heart attack if she had gone on a diet as her doctor recommended. // If Suzanne had gone on a diet as her doctor recommended she wouldn't have had the heart attack.

SECOND CONDITIONAL

The second conditional is used when it is unlikely to happen, say an example that youwin the lottery

If I won the lottery I Would buy a Ferrari (if I play the lottery, I'd buy a Ferrari)

Subject IF + (I) + Past Simple (won) + the rest of the sentence (the lottery) + Subject (I) +Would + verb in present tense (buy) + the rest of the sentence (a Ferrari)

The second conditional (also called conditional type 2) is a structure used to talk aboutunreal situations in the present or in the future.
Just as the first conditional second conditional is the two clauses, clause "If" and main clause

clause "If the main clause "-----------------
If I had a million dollars, I Would buy a big house.

We use different verb forms in each part of a second conditional:
clause "If" == + if + simple past verb subject *
main clause subject == Would + verb +

WOUL

It is an aid to the second conditional. It comes from "will", which is an auxiliary of the futureis sometimes used to offer, or invite applications:. I'll give you an example:

Would I eat = I eat.
She Would she sleep = sleep.
Would we run = We would run.

The structure for the Would denial is as follows:

Subject + Would + not + infinitive.

I Would not dance = He does not dance.
I Would not drink = I do not drink.
You'd like you like to study study =

Although the form "would not" is correct is not used when speaking, unless I want to emphasize something.
The most used is "Would"

Now for the question form:

This is its structure:
Would + subject + infinitive?

Would she read? = Does she read?
Would it rain? = ¿Rain?