Question

15．往往是火災(zāi)發(fā)生時，人們才意識到了解消防知識的重要性．
Usually people don't realizethe importance of knowing some knowledge about fire fighting until fires happen．

Answer 1

分析 the importance of knowing some knowledge about fire fighting until fires happen．

解答 答案：the importance of knowing some knowledge about fire fighting until fires happen．這里是說客觀事實用一般現(xiàn)在時，realize是動詞意識到，是一個及物動詞，后直接加上賓語，這里是加上名詞短語做賓語，…的重要性用of所有格the importance of，后接名詞代詞或動名詞，了解know，一些消防知識some knowledge about fire fighting，故the importance of knowing some knowledge about fire fighting，后用until直到引導(dǎo)的時間狀語從句，主語泛指fires火災(zāi)，發(fā)生happen（偶然發(fā)生），故答案是the importance of knowing some knowledge about fire fighting until fires happen．

點評 until表示動作、狀態(tài)的持續(xù)，強(qiáng)調(diào)"一直到…為止"，或強(qiáng)調(diào)某個動作或狀態(tài)一直持續(xù)到另一個動作或狀態(tài)出現(xiàn)之前．常與表示延續(xù)性動作的動詞連用．
如：*I waited until three o'clock，but he didn't come．*He lived with his parents until he graduated from college．