11. The children couldn't go swimming because the sea was very rough.
The sea was too rough for the children to go swimming.
12. We didn't have enough money,so we didn't go on holiday.
If we had had enough money, we would have gone on holiday.
13. We got lost because we didn't have a map.
If had had a map, we wouldn't have got lost.
14. He couldn't afford to buy a car.
The car is too expensive for him to buy.
15. That restaurant is so dirty that noone wants to eat there.
It is such a dirty restaurant that no one wants to eat there.
16. The test was too difficult for the pupils to do.
The test was so difficult that the pupils couldn't do.
17. Phone now or you will be late.
You will be late if you don't phone now.
18. I advise you to put your money in a bank.
You'd better put your money in a bank.
19. Why don't you meet to discuss the price?
I suggest that you should meet to discuss the price.
20. I would prefer you to deliver the package on Monday.
I'd rather you delivered the package on Monday.