Ответ:

SHOULD

You should be carefull at the street.

You should cross the road only when the light is green.

You should look at the righ and left when you cross the street.

You should keep your important belongings in a safety place.

You should wear warm cloth when outside  is very cold.

You should help someone if you see him or her feeling bad.

SHOULDN'T

You shouldn't talk with the strangers.

You shouldn't speak on the phone when it's storming.

You shouldn't take anything from the strangers.

You shouldn't run when it is ice on the street.

You shouldn't  cross the road in the wrong place.

You should'n cross the road when the light is red.

You shouldn't walk alone in the dark unsafe street.

Объяснение: