Unit Three

    1. 这雨已经下了一整天了。
       The rain has been falling for a while day.

    2. -- 我已经写完作业了。你呢 
       -- 我已经写了两个小时，但还没写完。
       -- I've finished my homework.  What about you? 
       -- I've been doing it for two hours, but haven't finished it yet.

    3. 自春节后，我的体重一直在下降。
       Since the Spring Festival I've been losing weight.

    4. 我九岁时才上学。
       I didn't start to go to school until I was 9.

    5. 别让雨把这个箱子淋湿了。
       Keep the box from the rain.

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