Pengandaian : If

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​Functions of If Clause :

​1. as suggestion

2. as ​imperative

​3. as reminder

​4. as general truth

​5. as dream

​1. as suggestion

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​ If you are tired, you should take a rest

​ If you have a lot of mopney, you ought to share it to the poor ones.

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​If clause + S + should / ought to / had better

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​2. as imperative

​ If you don't want to be late, get ready soon.

​ If you get tired, go to bed.

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​If Clause + verb ( imperative sentence )

​3. as reminder

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​ If If you want to pass the exam, you must study hard.

​ If you want to get a lot of money, you have to work harder.

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​ If Clause + Subject + have to / need to / must

​4. as general truth

​ If we heat the water, it boils.

​ If you're 17 years old, you're be able to get the citizen card.

​ If you eat a lot, you gain weight.

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​If Clause ( present tense) + simple present tense.

​5. as a dream / hope

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​If I have a lot of money, I will build a big house.

​If I have a lot of money, I will share it to the orphanage.

​If I take a business major, I will build my own company.

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​If Clause + simple future tense