If clause
1.เหตุการณ์จริง (if + present simple, present simple)
- If you heat water, it boils.
- If you get here before 7.00, we can catch the early train.
2.เหตุการณ์เป็นเหตุเป็นผล (if + present simple, will +v.1)
- If I have enough money, I will go to Japan.
- If he is late, we will have to start meeting without him.
- If I have time, I will help you.
3.เหตุการณ์ที่ตรงข้ามความจริงในปัจจุบัน / อนาคต (if + past simple, would + v.1)
- If I knew her name, I would tell you.
- She would be safer if she had a car.
- If I were you, I would call her.
- If I were you, I would not sat that.
- If I were rich, I would buy home.
4. เหตุการณ์ตรงข้ามกับความเป็นจริงในอดีต (if + past perfect, would have + v.3)
- If you had worked harder, you would have pass the exam.
- If I had met you before, we would have been together.
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