英語(yǔ)語(yǔ)法順口溜：定語(yǔ)從句中的that用法

　　that用法真有趣， 兩個(gè)地方它不去;

　　逗號(hào)后邊它不去， 介詞之后不考慮;

　　That做為關(guān)系代詞，不可用在非限制性定語(yǔ)從句中，即不可用在逗號(hào)后邊;定語(yǔ)從句中介詞之后也不可使用。在逗號(hào)或介詞后，指物時(shí)用which,指人時(shí)用who或whom。

　　例句1)They arrived at a farmhouse, in front of ______sat a small boy.

　　A. whom B. who C. which D. that

　　解析：在介詞of之后指物，選擇C which。

　　例句 2)The engineer with _____my father works is about 50 years old.

　　A. whose B. who C. which D. whom

　　解析：選擇 D whom。介詞后指人。

　　例句 3)The letter is from my sister, ______is working in Beijing.

　　A. which B. that C. whom D. who

　　解析：選擇 D who。逗號(hào)后指人，在定語(yǔ)從句中做主語(yǔ)。