Here are a list of commands that affect the flow of control in your program.
ask-list-of-turtles
ask-patch-at
ask-patches
ask-turtle
ask-turtles
ask-turtles-with
die
dolist
dotimes
grab
grabbed?
if
ifelse
ignore
item
loop
reset-timer (resett)
resett (reset-timer)
stop
stopall
switch-scheduler
to-delimited-string
to-list
to-string
wait-until