The operation could prolong his life by two or three years.

　　這次手術可使他多活兩三年。

　　Only with a few people could she be her real self.

　　只有和幾個人在一起時，她才能表現出真實的自我。

　　I could come next week, or the week after.

　　我可能下周來，或者再下一周。

　　Could you put me through to the manager, please?

　　請幫我找經理接一下電話好嗎？

　　Could you just help me with this box, please?

　　請幫我搬一搬這箱子好嗎？