- 我可以肯定的说，他做生意一定永远不会成功。
It may safely be said that he will never succeed in business.
- 到外国一定很贵。
Visiting a foreign country must be expensive.
- 它一定是一家很贵的餐厅。
It must be a very expensive restaurant!
- 你一定会后悔的。
The time will come when you will be sorry for it.
- 露西一定会来的。
Lucy is certain to come.
- 今晚一定是好天。
The weather will be good tonight for sure.
- 你的计划一定会成功的。
Your plan is sure to succeed.
- 这个机器一定有什么地方不对劲。
Something must be wrong with the machinery.
