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This statement has the following look:

     if boolean_expression then

or with an alternative statement:

     if boolean_expression then

The if ... then statement consists of a boolean expression and a statement, which is conditionally executed if the evaluation of boolean_expression yields true.

If if ... then ... else is concerned, statement1 is executed depending on boolean_expression being true, otherwise statement2 is executed alternatively. Note: the statement before else must not finish with a semicolon.