Conditionals 0, 1, 2, 3 and Song

0 – Zero conditional

For things that are always true – rules, laws. Etc.
If you heat water to 100 degrees, it boilsit will boilit would boilit would have boiled.
If + present simple, + present simple



1 – First conditional
For things that will probably happen in the future under certain conditions. They are likely.
If it is sunny, II goI will goI would goI would have gone to the beach.
If + present simple, + will + infinitive

or If + present simple + a different future tense



2 - Second conditional
For imaginary things that could happen under certain conditions. Very unlikely or impossible.
If I won the lottery, II buyI will buyI would buyI would have bought a house.
If + past simple, + would + infinitive

For things that didn't happen in the past and the consequences, for regrets. They are impossible.
If I had known you were coming I I bakeI will bakeI would bakeI would have bakeda cake. (I didn't know you were coming, I didn't bake a cake!)

If + past perfect, would + have + past participle