already是什么時態的標志?

　　例句：

　　We've already said our goodbyes.

　　我們已經道別了。

　　The car was already on the move.

　　汽車已經開動了。

　　She's backpedalled twice already.

　　她已經兩次改變主意了。

　　Eight o'clock had already chimed.

　　已敲過八點鐘了。