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 conditionalIt 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 + , + presentor simple present + when/if present 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.htmhttp://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-1/exerciseshttp://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/1cond2.htm2nd 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 pastExamples:
- 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.htmhttp://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exerciseshttp://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exercises?023rd conditionalIt 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.php3http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-3/exerciseshttp://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/3cond1.htmhttp://www.englishgrammarsecrets.com/thirdconditional/exercise1.swfhttp://www.englishgrammarsecrets.com/thirdconditional/exercise1.swf2nd conditional (present unreal) vs. 3rd conditional (past unreal)http://www.englishpage.com/conditional/conditional6.htmhttp://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/condit3.htmhttp://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/allcnd1.htmzero, 1st, 2nd and 3rd conditional quizhttp://www.englishclub.com/grammar/verbs-conditional_quiz.htm1st, 2nd and 3rd conditional quizhttp://www.eflnet.com/grammar/conditionals.phphttp://www.ego4u.com/en/cram-up/grammar/conditional-sentences/exercises?05http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/exercises?06http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/cat-and-mouse