No, you don't. The begin/end the guy above me talks about is if your IF/ELSE statements have multiple lines.
So:
IF %SCORE = 3 THEN
BEGIN
%HEALTH := 4
%ATTACK := 3
END
ELSE
BEGIN
%HEALTH := 7
%ATTACK := 7
END
Is how you'd use it (if I'm not mistaken). So long as you do the if statements correctly, you don't need anything else to separate them. As an example, this is in one of my stories:
%SCORE := 0
IF %E0AGOOD = 1 THEN %SCORE := %SCORE + 1
IF %E0TGOOD = 1 THEN %SCORE := %SCORE + 30
IF %E0IGOOD = 1 THEN %SCORE := %SCORE + 500
IF %E0OGOOD = 1 THEN %SCORE := %SCORE + 7000
IF %TRUEEND = 1 THEN %SCORE := %SCORE + 90000
Notice how I don't need anything between each IF statement.