Conditional Sentences

Conditional sentences are also as Conditional Clause or If Clause. Conditionals are statments with If or unless. You can use conditional clauses to talk a possible situation and its results.
There are two kinds of conditionals : real/factual conditionals and unreal/contrary-to-fact-conditionals.
1. Factual/Real Conditionals
 When you are talking about something which may possibly happen in the future, you use this type of conditional.

2. Unreal/Contrary-to-fact Conditional
When you are talking about something that yau think is unlikely to happen, you use this type of conditional.

The fact is :  > I don't have cellphone, so I won't call him.
                   > I am not teacher, so I won't punish her.

Sumber : Sudarwati dan Eudia Grace. 2007.  Look Ahead Book 2. Jakarta : Erlangga.