adv 究竟什么时候(at whatever time)：W～will you grow up/did you leave? 你究竟何时才能长大/才离开的? W～can you return my book?　你究竟什么时候才能还我书?

conj(1)无论何时(at any time)：You may leave～you are ready/pleased. 你什么时候准备好/高兴就什么时候走。Come～you like/want to. 你愿意什么时候来就来。You can have it～you wish. 你无论什么时候想要就拿走。W～needed， I'll be ready to help. 你什么时候需要帮助我准帮你。

(2)每次(当，回) (every time that)： W～anyone was ill，he installed himself as sick-nurse. 每当有人生病，他总是亲自护理。Come and talk to me～you feel lonely. 每当你感到寂寞的时候，就过来和我聊聊天。I go to the theatre～I get the chance. 每当有机会我就去看戏。I avoid physical conflict～possible. 只要有可能，我总是避免与人挥拳动武。The secretary arranged for this man to come～needed. 每当需要时，秘书总是安排这个人前来。

or whenever 或任何时间(infml)：You can come to see me at 2 p.m. or～tomorrow. 你可以在下午两点或明天的任何时间来见我。

←when adv，conj & n