a REPEAT must be followed by an UNTIL

an END is needed after a FOR loop

the control variable in a FOR loop must be a local variable

an = is needed in a FOR loop

a TO is needed in a FOR loop

a DO is needed in a FOR loop

an END is needed for a WHILE loop

a DO is needed in a WHILE loop

an END is needed for a CASE statement

an OF is needed in a CASE statement