1.He wants to invite you to a dinner but he does not have enough money.
2.You should sweep the floor before mopping it.
3.Please sprinkle the floor before mopping it.
4.I do not want to cook tonight,shall we eat outside?
5.That clothes cost 600 RM,but he has only got 300 RMB in his pocket,so he can not afford it.
欢迎指正,仅供参考