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SAT语法请教2the chief announced that his police force will conti

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SAT语法请教2
the chief announced that his police force will continue their battle against the criminal until they brought it under control.
答案说brought 错,我承认,时态确实有问题,可是
1.这句话本身时态是否有问题?announced 后引导的宾语从句will应该是would吧?
2.it指代criminal好怪啊?criminal不是人么?
3.police force是复数吗?
The chief announced that his police force will continue their battle against the criminal until they brought it under control.
1.主句中的谓语动词用了过去时态 announced,一般说来,主从句中的时态要保持一致,宾语从句中应该用过去将来时 would continue.但这一点并非是一成不变的.如果说长官宣布过警察机关的警员“曾经要继续”与犯罪人战斗的话,那么主从句的时态必须保持一致;如果此刻在现场的人说警察署长宣布过的是“从当时到现在的以后都要继续”战斗,那么从句中的时态就不必顾及主句的时态.
对第一种情况而言,句子中就出现了两处错误,整个句子需要改为——
The chief announced that his police force [would] continue their battle against the criminal until they [had] brought it under control.
但是,改错题只有一处错误,因此只能属于上面说的第二种情况,整个句子需要改为——
The chief announced that his police force will continue their battle against the criminal until they [have] brought it under control.
重要说明:这里说的是直到完全“制服”犯罪人以后,战斗才不再“继续”进行,因此“制服”必须要用现完成时态表示.
2.人称代词it 常用来指代性别不明的人物.criminal 是个中性名词,既可以指男性也可以指女性,因此只能用 it 指代.
3.police force是集合名词,如果单指警察机关的组织,就是单数概念;如果指全体警员,就是复数概念.同样的例子还有 family,指家庭整体为单数,指家庭成员为复数;class,指一个班级为单数,指全班同学为复数,等等.