Answer:
g. If she HAD KNOWN the answer, she might have told us.
h. If you switch the machine on, it WILL START.
i. Don't drink the cold drinks if you HAVE fever.
j. If she WAS rich, she would drive a car.
k. If they HAD time, they would have visited us.
l. Book a ticket in advance if you WANT to watch final match in stadium.
hope that helps...