1.我們昨天6點到了他們家。
    We reached their house at six yesterday. (reach 是及物動詞，直接跟賓語)
    2.既然你們都來了，咱們就開始吧。
    Since you are all here, let’s start.
    3.這件事是怎樣發(fā)生的，誰也不清楚。
    How this happened is not clear to anyone.
    4.我們樓上有兩間空房，過去兩年內都沒怎么用。
    We have two spare rooms upstairs,neither of which has been much used in the past two years.
    5.很高興聽說你以優(yōu)異的成績通過了這次考試，祝你在未來的日子里一切順利。
    I am so glad to hear that you have passed the examination with a good record. And wish you the best of everything in the future.
    6.To be conscious that you are ignorant is a great step to knowledge.(英譯漢)
    自知無知乃是邁向知識的一大步。