1.We must not spend much time outside when the sun shines brightly and it is too hot .
2.We must not drink too much cold drinks . It will cause some problems with our sore throut.
3.We must not stay outside without cap when it is hot .
4.We must not allow the children to stay in the swimming pool as much as they want .
5.We must not to go to the picnic in the forest without wearing right clothes . Many insects can bite us .