回答楼主:
主将从现:①If you use your head,you will find a way.
②We will give you a good price if you are thinking of buying it.
③I will go to the park if it doesn't rain tomorrow.
④I will ring you up
as soon as I get to Beijing.
⑤Your parents will be very happy if you try your best to study.
主祈使从现:①Please let me know if he comes back.
②Water the flowers please if it doesn't rain tomorrow.
③Don't be sad if you fail the exam.
④Turn right when you see the supermarket.
⑤Turn off the lights as soon as you leave home.