Final answer:
When you see a 'Begin School Zone' sign, you should slow down and watch for children.
Step-by-step explanation:
When you see a 'Begin School Zone' sign, you should slow down and watch for children. This sign indicates that you are entering an area where there are likely to be students present, such as near a school or playground. It is important to drive cautiously and be prepared to react to any potential hazards, such as children crossing the road.