e sure
确信,肯定
例句:
When you start the engine,be sure the car is in neutral.
你在发动引擎时,一定要让汽车处于空档.
Can I be sure of a profit if I invest?
我要是投资,肯定能获利吗?
He likes to be sure of his bodily comforts.
他注重身体上的舒适.
而Know for sure是指“知道确切的情况；确知”跟know for certain一样.
两者语气不同,前者更加确定,而后者比较偏中性!