ex.3 p.36 write your answere  1) what should you do to get to school?  2) what must we do when the trafficl ights turn red?  3) when can a child walk?  4)who may come to your place in the evening? 

1)We should be very careful while going to school.
2)We should stop and stay until the traffic light turns green.
3)A child can walk only when it`s not dark in the street.
4)Only parents may come in the evening to your place after their working-day.