表示附有条件的意愿，在不同的场合也有不同的表达方式。在一般的场合，用as long as 或but等句型来表达。如：Surely I will ,but you must be punctual. I should be delighted, but don’t make dirty the carpets. I’ d like to, as long as I’m free.在比较正式的场合，则用 provided that 等来表示附加条件。如 By all means, provided that he is a good man. Very well, provided that you don’t trouble me.
Keys
1. OK, as long as it’s sunny. 好的，只要天晴。
2. Sure, but be careful. 当然，不过要小心。
3. Of course, if you pay more. 当然，只要你多付点钱。
4. Yes, I will, but you must go with me. 好的，但你必须和我一起走。
5. Very well, but don’t forget your duty. 很好，不过别忘了你的职责。
Notes
第一和第二句用在比较随便的场合，as long as 可以用if 代替。第五句用在比较正式的场合。