4. Zeroconditional: certainly If+ present simple = present simple. Ex: ifIam late my fathertakes me toschool. ->my fathertakes me toschool,ifIam late
5. first conditional: real possibility If + present simple = future. If you study hard, You will pass your exam. You will pass your exam If you study hard.
6. Second conditional: dreams If + past simple = would, should, could and might + base verb. Ex: If I won the lottery I Would buy a car.
7. Thirdconditionals: no possibility If + past perfect + would have+ past participle. Ifthey had not passed the exam their teachers would have been sad.