1、If it's fine tomorrow,we'll go to the Great Wall.
2、if It rains tomorrow, we won'tgo to the seaside.
3、if I am free,I'll come here on Sunday.
4、if we win a lot of money,we'll travel round the world.
5、if you don't hurry ,we'll miss the train.
很容易的,希望能帮助你,希望及时采纳,祝你渡过难关