Before是表示過去，應用於過去完成時態。過去完成時1. 概念：表示以過去某個時間為標準，在此以前發生的動作或行為，或在過去某動作之前的行為，即“過去的過去”。2. 常見時間狀語標誌：before, by the end of last term / week / month / year 等。例如：Most of the guests had left when he arrived at the party. 當他到達晚會現場時，大多數客人已經離開了。By the 1990s the number had fallen to about 50,000. 截止到20世紀90年代， (藏羚羊的) 數量下降到了大約5萬隻。 Before he volunteered to direct the traffic, Timoteo had had lots of jobs. 鐵穆特歐在志願指揮交通之前做過很多工作。before long與long before的區別Before long, he went to America. 不久，他就去了美國。I hope to see you before long. 我希望不久後再見到你。She said she had read the novel long before. 她說她很久以前就讀過這部小說。That happened long before. 那件事發生在很久以前。
Before是表示過去，應用於過去完成時態。過去完成時1. 概念：表示以過去某個時間為標準，在此以前發生的動作或行為，或在過去某動作之前的行為，即“過去的過去”。2. 常見時間狀語標誌：before, by the end of last term / week / month / year 等。例如：Most of the guests had left when he arrived at the party. 當他到達晚會現場時，大多數客人已經離開了。By the 1990s the number had fallen to about 50,000. 截止到20世紀90年代， (藏羚羊的) 數量下降到了大約5萬隻。 Before he volunteered to direct the traffic, Timoteo had had lots of jobs. 鐵穆特歐在志願指揮交通之前做過很多工作。before long與long before的區別Before long, he went to America. 不久，他就去了美國。I hope to see you before long. 我希望不久後再見到你。She said she had read the novel long before. 她說她很久以前就讀過這部小說。That happened long before. 那件事發生在很久以前。