主句没有连词,从句才有连词,并且连词一般放在从句开头.从句的位置是比较灵活的,一般可放主句前,也可放主句后.
If you study hard,you will pass the exam.
You will pass the if you study hard.
Even though he is poor,he often shares his little food with the homeless man.
He often shares his little food with the homeless man even though he is poor.
Before you leave the room,don't forget to turn off the light
Don't forget to turn off the light before you leave the room