The manager is certain that the new budget will be approved by Friday.

經理確定新預算會在週五前獲得核准。

Are you certain the shipment left the warehouse this morning?

你確定那批貨今天早上已經離開倉庫了嗎？

I'm not certain the candidate has enough experience for this senior position.

我不確定這位應徵者是否有足夠經驗擔任這個資深職位。