主语和代词在人称和数方面要一致。 【错例】The question was so difficult that I couldn't answer them. 【改正】改them为it。因为question为单数。 【句意】这个问题很难，我不会回答它. 【归纳】注意下列句子中主语与代词的一致： 1) 其他人称+and I要与our， ourselves一致： He and I have done our homework. 2) You and he(she) 要与your， yourselves一致： Can you and he express yourselves in English? 3) something，anything，everything和nothing要与it一致： Nothing can be taken out of the room， can it? 4) somebody，anybody，someone，anyone，everybody， everyone， nobody， no one， none 一般要与he， his， himself一致。如：Everybody enjoyed himself very much. 但在非正式英语中，也可以与复数代词取得一致。如， Everybody knows what they ought to do. None of them can do the work， can they? Everybody looked after themselves。 5) those要与their一致； Those who haven't got their tickets before-hand have to wait in queues at the booking-office。 事先没有得到票的人必须在票房站队等候。 但those及其修饰部分用作呼语时， 要与your一致： Those who are against the plan, please put up your hands. 反对这个计划的人请举手。 6) those of us要与our一致； those of you与your一致。如： Those of us who haven't returned our books to the library on time shall be fined. 我们当中还没把书按时还到图书馆的人是要罚款的。 7) 复数主语+each are要与复数代词取得一致； 复数主语+are each要与单数代词一致： They each are eager to see their own wives。 他们都渴望见到自己的妻子。 They are each eager to see his own wife。 (意思同上，后面斜体部分不可互换) 本文来源：https://www.wddqw.com/doc/e71b5bd5d938376baf1ffc4ffe4733687e21fcc4.html