If water is heated to 100ºC, it boils. CONDITIONAL CLAUSES There are two clauses: The condition clause with “if” The result clause that states the possible outcome. If water is heated to 100ºC, it boils.

If water is heated to 100ºC, it boils. Zero FACTS and TRUTHS If + Pres. Simple, + Pres. Simple If water is heated to 100ºC, it boils. TO GIVE ORDERS If + Pres. Simple, + Imperative If Sam asks you for my telephone number, don’t give it to him.

If you come to my house, you will meet my parents. FIRST - I Possible situations in the FUTURE If + Pres. Simple, + WILL infinitive If you come to my house, you will meet my parents. It can also be used to make THREATS and PROMISES If you do that again, I will tell mum and dad. I won’t use your mobile phone again if you don’t want me to.

SECOND - II If + Past Simple, + would infinitive Imaginary or improbable situations in the present or future: If + Past Simple, + would infinitive If we had a week off, we would go to London. If I were rich, I’d buy a new house. It can also be used to give ADVICE If I were you, I’d go to the doctor’s.

If they had come to the party, they would have had a great time. THIRD - III Impossible situations in the past If + Past Perfect + would have participle If they had come to the party, they would have had a great time. It can also be used to talk about situations we REGRET If I had studied harder, I wouldn’t have failed the exam.

CONDITIONAL CLAUSES I II III Zero If + Pres. Simple, + Pres. Simple FACTS and TRUTHS Zero If + Pres. Simple, + Imperative TO GIVE ORDERS Possible situations in the FUTURE – THREATS - PROMISES I If + Pres. Simple, + WILL infinitive Imaginary situations in the present or future & ADVICE II If + Past Simple, + would infinitive III Impossible situations in the past & REGRET If + Past Perfect + would have participle