Conditionals-Ingles

Conditionals 

Conditional clauses consist of two parts: the if-clause (hypothesis) and the main clause (result).

When the if-clause comes before the main clause, the two clauses are separated with a comma.
Example:      If the weather is good, we will go on a pic nic. 

NOTE: We don´t use a comma when the if-clause follows the main clause.
Example: We will go on a picnic if the weather is good.