1. if

2. unless

3. if

4. if

5. unless

6. if

7. if

8. unless

9. if

10. unless

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- if not = unless : trừ khi

- Câu điều kiện loại 1: If +  S + V(s/es) + O, S + will/model verbs + V_inf + O

If you study hard, you can’t get a good mark.
Unless Brian is tired, we will go cycling as usual.
If the weather is sunny tomorrow, we will go to the beach.
Unless it rains heavily, we won’t drive anywhere tomorrow.
If I have time, I won’t help you with your DIY items.
If my friends know my secret, I won’t feel comfortable.
Unless Sue buys snacks every day, she will be short of money soon.
If Calvin remembers about his promise, I will remind him about it.
If Ms. Anna arrives at the airport on time, she won’t miss her flight again.
If my father gets stuck in the traffic, he will come to pick me up in time.

* công thức áp dụng : 

 +) S + V (hiện tại đơn), S + will + V (nguyên thể) 

 +) Unless S +  V (hiện tại đơn), S + will + V (nguyên thể) 

( cần phải dịch nghĩa )