IF clause or Conditional Sentence Type 1

Conditional I

Use to express If condition based on fact in this moment, and fact in the future. IF clause usually in Present Simple Tense.

Form

(IF clause)	(main sentence)
If I see you tomorrow,	I will buy you a drink.

Or

(main sentence)	(IF clause)
I will buy you drink	if I see you tomorrow

Usually we use unless that mean is IF…NOT  

Form

(IF clause)	(main sentence)
Unless you hand in your homework,	I won't mark it.
MEANING
If you don't hand in your homework,	I won't mark it.

Or

(IF clause)	(main sentence)
I won't mark your homework	unless you hand it in
MEANING
I won't mark your homework	if you don't hand it in

Note: Do not use will or won’t in IF CLAUSE Contoh:

• If I have time today, I will phone my friend. = I will phone my friend, if I have time today.
• If I go to England, I will buy some Cheddar cheese. = I will buy some Cheddar cheese, if I go to England. 

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