1 if it not too cold, they can go swimming
2 if we knew you were in hospital, we could visit you
3 if the doctors can find out the remedy, they can save a lot of people
4 if we use public bus service , we will get rid of pollution in the city
5 if the patient had got the treament he had not died
6 if i had had an umbrella i hadnt got wet in the rain
dạ e mới l8 nên có sai gì thông cảm ạ ( ><)