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1If we are careful enough，we cannot make mistakes.
2We should finish homework in time.
3If there is no water,fish can't live.
4He didn't go to school because he was ill yesterday.

1.If we are careful enough ,everything will be all right.
2.We must finish the homework in time.
3.Fish must live with water.
4.If he was fine yesterday ,he would go to school.

1.if we are careful enough,we can make everything right
2.we should finish the homework in time
3.only in water can fish live
4.he didn't go to school because he was ill yesterday