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`1` If there were not many tourists visiting the national parks , the environment there would not be badly damaged .

`2` If Nam could swim , he would be allowed to go to the swimming pool .

`3` If Hoa didn't have so much homework , she could go out with her friends tonight .

`4` If you were not under `19` , you could drive a car .

`5` If I could swim , I would be going to scuba-diving with you .

`@` Câu điều kiện diễn tả hành động không có thật ở hiện tại .

`=>` Điều kiện loại `2` : If + S + V(quá khứ)/were + O , S + would/modal verbs + V-inf + O .

`-` Biến thể : Unless + S + V(quá khứ)/were + O , S + would/modal verbs + V-inf + O .

`-` Biến thể : If I were you , S + would/modal verbs + V-inf + O : Đề nghị khuyên ai làm gì .