Hii Kira ! this is a review of the Conditionals and i wish that it will help you: There are basically four types of conditional ,though combinations of the four are also possible depending on the context. *Zero Conditional: if + present==> present Expresses general truths and scientific facts.Used to show an evidence ,when it's always true. Exemple: If it rains,the sun doesn't shine. *First Conditional: if + present==> will + inf We use it to make predictions or talk about actions or states that may or may not happen (likely 50/50) Ex: If it rains,i'll stay at home. *Second Conditional: if + past simple==> would + inf Refers to actions or states that are not real or unlikely to be real in the future. Ex: If i won 1,000,000, i would travel. *Third Conditional: If + past perfect==> would have + past participle. Refers to actions in the past,and can be used to express regrets. Ex: If you hadn't given me a lift,i would have missed the train. I hope that i made things clearer than before,, if you have any other questions or ideas that you would like to send forward to us, to please do that,don't be shy,you are welcome Kira :)

you are welcome ........

Thank you for explanation of "zero conditional", now i understand better. I don't understand in which cases i have to use them.

zero conditionals use it when you are talking about something which is always true or always happens as result of something else if +present simple , present simpe (in the other clause ) also I think that you can also use the present progressive or present perfect in either clause ....I wanna ask you you dont know when you have to use which one or you dont know which tenses you have to use in any conditionals ?