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2)I must write it down before I fet it. (3)We do want to buy something now before prices go up. “與其說 …… 倒不如”,“與其 …… 毋寧 ……” 只用 before。例: (1)It was quite some time before he found the elephant at all. (2)We had walked a long way before we found some water. (3)We had sailed for two days before we saw the land. (4)The fire lasted about four hours before the firefighters could control it. (5)It was midnight before my brother came home. (6)It was three months before they met again. ,就發(fā)生主句謂語動作,只用 before。 、終止性謂語動詞,只用before。t leave the l