I ought to knowKNOW somethingused to emphasize that you know about something because you made it, experienced it etc 我应该知道〔强调你知道某事,因为你做过或经历过等〕 ‘Are you sure there’s no sugar in this coffee?’ ‘Of course. I ought to know – I made it!’ “你肯定这杯咖啡里没有糖吗?”“当然肯定,我自己冲的我还不知道!”
I ought to know• I've had nine, so I ought to know.• Christmas is coming and he thinks I ought to know about some little joints called Tiffany's and Bloomingdale's.• "Are you sure there's no salt in it?" "Of course. I ought to know, I made it."• But if it meant this I ought to know it.
→ I ought to know at know1(SPOKEN SECT)