sub..endsub group
sub - Begin subroutine
endsub - End subroutine
return - Exit subroutine
call - Call subroutine
do..while group
do - Begin block
while - End block
break - Exit block immediately
continue - Skip to next condition evaluation
while..endwhile group
while - Begin block
endwhile - End block
break - Exit block immediately
continue - Skip to next condition evaluation
repeat..endrepeat group
repeat - Begin block
endrepeat - End block
if..endif group
if - Begin block
endif - End block
elseif - Else
else - Else