Transferring control

If the condition tested is true, one of the following actions takes place:

• If statement-1 is specified, statement-1 is executed. If statement-1 contains a procedure branching or conditional statement, control is transferred according to the rules for that statement. If statement-1 does not contain a procedure-branching statement, the ELSE phrase, if specified, is ignored, and control passes to the next executable statement after the corresponding END-IF or separator period.
• If NEXT SENTENCE is specified, control passes to an implicit CONTINUE statement immediately following the next separator period.

If the condition tested is false, one of the following actions takes place:

• If ELSE statement-2 is specified, statement-2 is executed. If statement-2 contains a procedure-branching or conditional statement, control is transferred, according to the rules for that statement. If statement-2 does not contain a procedure-branching or conditional statement, control is passed to the next executable statement after the corresponding END-IF or separator period.
• If ELSE NEXT SENTENCE is specified, control passes to an implicit CONTINUE STATEMENT immediately following the next separator period.
• If neither ELSE statement-2 nor ELSE NEXT SENTENCE is specified, control passes to the next executable statement after the corresponding END-IF or separator period.

When the ELSE phrase is omitted, all statements following the condition and preceding the corresponding END-IF or the separator period for the sentence are considered to be part of statement-1.