раскройте скобки в предложениях и поставьте в нужную форму..
You should go to the doctor if you _ (not feel) well.
If the weather (be) bad on Saturday, we _ (stay) at home.
You should go to the doctor if you don't feel well. - придаточное условия 1 типа
If the weather is bad on Saturday, we'll stay at home.- придаточное условия 1 типа
You should go to the doctor if you do not feel well.
If the weather is bad on Saturday, we will stay at home.