CONDITIONAL

CONDITIONALS

First Conditional
The first conditional has the present simple after 'if', then the future simple in the other clause

If it rains, I won't  go out.
I won't go out if it rains.
If I go to the beach, I will tan.
I will tan if I go to the beach.

 If + present +complement+ will +present tense+complement.

USES 
 
Nature: Open condition, what is said in the condition is possible.

Time: This condition refers either to present or to future time.
 If he is late, we will have to go without him.

 

Second Conditional
The second conditional uses the past simple after if, then 'would' and the infinitive.

If I had a super power, I  would kill bad people.
I would kill bad people if I had a super power.
If I had money, I would buy a house
I would buy an house if I had money.

If+ past simple+complement+ would+present+complement

USES

 Nature: unreal (impossible) or improbable situations.

Time: present; the TENSE is past, but we are talking about the present, now.
 If I won a million pounds, I would stop teaching. (improbable)

 Third Conditional 
We make the third conditional by using past perfect the after 'if' and then 'would have' and the past participle in the second part of the sentence.

If I had studied, I would have passed the exam.
I would have passed the exam If I had studied.
If I had gone to the party, I would have met people.
I would have met people if I had gone to the party.  

If+past perfect+complement+would have+ past participle+complement.

USES 


Nature: unreal

Time: Past (so we are talking about a situation that was not so in the past.
If you had warned me, I would not have told your father about that party.(But you didn't, and I have).

ZERO CONDITIONAL 

We can make a zero conditional sentence with two present simple verbs (one in the 'if clause' and one in the 'main clause').

If I go to shopping, I buy many shoes.
I buy many shoes if I go to the shopping. 
If people eat too much, they get fat 
they get fat if peolpe eat too much.

if+ present+complement+ present+ complement

 

 link for to practice.....
http://www.perfect-english-grammar.com/first-conditional-exercise-1.html
http://www.learnenglishfeelgood.com/grammar-secondconditional2.html 
http://www.perfect-english-grammar.com/third-conditional-exercise-1.html
http://www.learnenglish-online.com/grammar/tests/zeroconditional.html 
http://www.englishexercises.org/makeagame/viewgame.asp?id=3226