定語從句先行詞是人稱時，連線詞可以用that嗎?
一般說來，在定語從句中，先行詞指人時，關係代詞通常用who/that引導;而當先行詞指物時，關係代詞通常用that/which引導。而用which指人的情況出現甚少。但在下列幾種情況下，當先行詞指人時，定語從句中的關係代詞用which,而不用who。
現歸納如下：
一、當先行詞強調個人的職業特徵而非強調人時。
He is a professor,which commands our great admiration.他是個教授，教授是讓我們極為欽佩的`。
After graduating from university, he became a lawyer,which his relations wanted him to be.大學畢業後，他當了律師，這也是親屬們想要他從事的職業。
二、當先行詞強調個人的性格特徵時。
He is the man which he was.他還是象過去那個老樣子。
Bonny is quite different from the girl which I thought her to be.邦妮完全不是我曾認為的那種女孩。
三、當先行詞強調人物的身份、地位時。
They talked like a foreigner which they hardly were.他們說起話來像個外國人，而他們根本就不是。
Bill pretended to be a cleaner which helped him to escape from prison.比爾裝成清潔工，這可幫他逃出了監獄。
四、當先行詞指嬰幼兒、小孩時。
My elder sister had a baby which was a girl yesterday.我姐姐昨天生了個女孩。 He made a face to the child which was in the mother's arm.他對抱在母親懷中的嬰兒做了個鬼臉。
五、當先行詞是集體名詞被看作一個整體時。
Yao Ming is very interested in American public which warmly supports him.姚明對熱情支援他的美國民眾很感興趣。
I take great pride in the Western Chinese people which has a long history, a rich culture and glorious revolutionary tradition.我作為西部的中華民族感到驕傲自豪，這是個有悠久歷史、燦爛文化和光榮革命傳統的民族。
六、當先行詞強調人的品德素養時。
Sun Nan is a successful singer which gets him high fame in China.孫楠是個成功的歌手，這使他在中國名聲大震。
He is a gentleman which his little brother isn't. 他很有紳士風度，他弟弟卻沒有。
