Question

10．自从派了更多的警察在路口指挥交通，交通违章的人数大大减少了．（since）The number of people who break the traffic rules has decreased sharply since more policemen were sent to direct the traffic at the crossroads．．

Answer 1

分析 The number of people who break the traffic rules has decreased sharply since more policemen were sent to direct the traffic at the crossroads．

解答 The number of people who break the traffic rules has decreased sharply since more policemen were sent to direct the traffic at the crossroads．
根据句意"自从派了更多的警察在路口指挥交通"可知，句子主句的时态用现在完成时，since引导的从句用一般过去时，而定语从句中的时态用一般现在时表示一般性的行为．
本句为一主从复合句，since引导的为一时间状语从句，主句中含有who引导的定语从句，修饰先行词people，break the traffic rules交通违章；direct the traffic指挥交通．

点评 学会运用复合句，运用不同的句式能够丰富句子的表达形式．