Sb. is sure that……（某人敢肯定……）

e.g. I am sure tha that building will be completely distroy if there is an air attack.

我敢肯定那座楼在空袭中一定被完全炸毁了。

e.g. For his part, Kennedy was sure that we had enough for nearly any conceivable contingency.

在肯尼迪看来，他深信我们已经拥有足够的力量去应付几乎任何可以设想得到的意外事故。