Are you positive the shipment left the warehouse before noon yesterday?

你確定那批貨昨天中午前就離開倉庫了嗎？

The client gave a positive response to our revised proposal during the meeting.

客戶在會議中對我們修改後的提案給予肯定的回應。

I'm positive I booked the hotel for three nights, not two.

我很確定我訂的飯店是三晚，不是兩晚。