`II`

`1` If the students study hard, their teachers will be very pleased.

`2`If I am awarded the scholarship, I will go to university.

`3` If it rains, we will stay at home and watch TV. 

`4` If you arrive in Paris, please send me a postcard.

`5` You should take a rest if you feel tired.

`-` should do sth: nên làm gì

`6` If we want not to be late for class, we must run as quick as possible.

`-` must do sth: phải làm gì

 7` If your homework is ready, you may leave class now.

`-` may do sth: có thể làm gì

`8` If you don't return this book to the library today, you have to pay a fine.

`-` have to do sth: phải làm gì 

`III`

`1` Unless you like this shirt, I'll bring you another.

`2` People won't get more diseases unless the water is contaminated.

`3` Unless she comes late again, she won't lose her job.

`4` Rice plants won't grow well unless there is enough rain.

`5` He can't pass the exam unless he studies hard.

`=======`

`-` Câu điều kiện loại `1` `->` diễn tả sự việc, hành động có thể xảy ra ở hiện tại hoặc tương lai:

`@` If + clause (HTĐ), S + will/can (not) + V

`-` Unless `=` If .. not: nếu ... không ...