將來完成時 1) 構成will / be going to do sth. 2) 概念 a. 狀態完成:表示某事繼續到將來某一時為止一直有的狀態。b. 動作完成:表示將來某一時或另一個將來的動作之前,已經完成的動作或一獲得的經驗。 they will have been married for 20 years by then. you will have reached shanghai by this time tomorrow