CONDITIONALS (Zero, 1st, 2nd and 3rd)

We use the grammar stuctures "conditionals" when we want to talk about conditions and their results.
There are conditionals to express real-life or probable situations (zero conditional and 1st conditional) and to express unreal, imaginary or improbable situations (2nd conditional and 3rd conditional).

Zero conditional
It is used to talk about what you normally do, or what normally happens in real-life situations. To express something that is always or generally true.

When/If simple present + , + present
or
simple present + when/if present

Example:

• If you freeze water, it turns into ice.
• I get tired if I work too much.
• The water boils if you heat it at 100 ºC

http://perso.wanadoo.es/autoEnglish/gr.zero.p.htm
http://perso.wanadoo.es/autoenglish/gr.zero.i.htm
http://www.englishmedialab.com/Quizzes/preintermediate/zero%20conditional.htm
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/0cond1.htm

1st conditional

It is used when you have a situation and you are not sure about its result. You express probable and possible results.

If simple present + ,+ future (will, going to, might)
or
future (will, going to, might) + if simple present

http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/1cond1.htm
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-1/exercises
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/1cond2.htm

2nd conditional
It is used to talk about what you would generally do in imaginary situations, dreams or hypothesis about present situations.


If simple past + , + would/could/ might/should
or
would/could/ might/should + if simple past
Examples:

• If I owned a car, I would drive to work. But I don't own a car.
• A: What would you do if you won the lottery? B: I would buy a house
• I would play basketball if I were taller.

http://www.better-english.com/grammar/cond2.htm
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exercises
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exercises?02

3rd conditional
It is used to talk about talk about 'impossible' conditions, impossible because they are in the past and we cannot change what has happened. Dreams or hypothesis about past situations.

If past perfect + , + would/could/ might/should have + (verb in participle)
or
would/could/ might/should have + (verb in participle) + If past perfect

Examples:

• If she had had time, she might have gone to the party (but she didn't have time).
• I would have read more as a child if I hadn't watched so much TV. Unfortunately, I did watch a lot of TV, so I never read for entertainment.
• If Jack had worked harder, he would have earned more money. Unfortunately, he was lazy and he didn't earn much.

http://www.learn4good.com/languages/evrd_grammar/3rdconditional.php3
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-3/exercises
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/3cond1.htm
http://www.englishgrammarsecrets.com/thirdconditional/exercise1.swf
http://www.englishgrammarsecrets.com/thirdconditional/exercise1.swf



2nd conditional (present unreal) vs. 3rd conditional (past unreal)
http://www.englishpage.com/conditional/conditional6.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/condit3.htm
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/allcnd1.htm

zero, 1st, 2nd and 3rd conditional quiz
http://www.englishclub.com/grammar/verbs-conditional_quiz.htm

1st, 2nd and 3rd conditional quiz
http://www.eflnet.com/grammar/conditionals.php
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/exercises?05
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/exercises?06
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/cat-and-mouse