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考点二、介词与关系代词连用
作介词与关系代词连用的习题时，要看两点：一看先行词前需要什么介词，二看定语从句的谓语动词后需要什么介词。最简单的方式就是将定语从句还原成一个独立的句子，结果就一目了然。如：
1、The place at which the bridge is supposed to be built should be where the cross-river traffic is the heaviest. (定语从句还原就是：The bridge is supposed to be built at the place. 这样就可以判断引导词需要介词at。也可以看先行词the place前需要介词at进行判断。)
2、I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back in the direction from which she had come.(从句还原就是：She had come from the direction，所以定语从句用from which 引导。)
3、There was a single person in the street to whom she turned for help.(从定语从句的谓语动词turn可构成词组turn to sb. for help就可以判断应该填to whom。)
4、The man about whom I talked just now is from Beijing University.(根据定语从句的谓语动词talk判断后需要of或about，因此此处需要about/of whom)
考点三、从句中的主谓一致
当定语从句的引导词在从句中作主语时，定语从句的谓语动词必须与先行词保持一致，这时引导词与谓语动词的数无关。如：
1. Tom is the only one of the workers in our company who has won a nation-wide fame.(汤姆是我们公司唯一一个赢得国家荣誉的工人。先行词为the only one。)
2. Tom is one of the workers in our company who have won nation-wide fames.(汤姆是我们公司赢得国家荣誉的工人之一。先行词为the workers。)
3. I, who am your friend for ever, will never turn against you. (我，你永远的朋友，永远也不会背叛你。先行词为I。)提醒：点这里加小编微信（领取免费资料、获取最新资讯、解决考教师一切疑问！）
