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.
我敢肯定那座樓在空襲中一定被完全炸毀了。
e.g. For his part, Kennedy was sure that we had enough for nearly any conceivable contingency.
在肯尼迪看來,他深信我們已經擁有足夠的力量去應付幾乎任何可以設想得到的意外事故。