形容詞從句是英語中較少用的從句，也較易犯錯。
最常見的形容詞從句是由關(guān)系代詞“who, whom, which, that, whose”等引導(dǎo)。這種代詞既是代詞，也是連詞。被“who”和“whom ”所修飾的先行詞（the antecedent）是“人”?！癢ho”是主語格（the nominative case）：“whom”是賓語格（the objective case）：“which”的先行詞是“動物”或“事物”，是主格，也是賓格：“that”是主格也是賓格，可以指“人物、動物、事物”：“ whose”是所有格（the possessive case），可以和“人物、動物、事物”連用。
上述各點都可以從下列例句中反映出來：
1. The boy who is watching TV is my nephew.
2. Do you know the man whom Jane is talking to?
3. The pen which was broken belonged to John.
4. This is the cat which came from Thailand.
5. The gentleman that has just walked past is our new manager.
6. The generation gap is a problem that concerns us all.
7. The principal will speak to those whose performance is not up to the standard expected.
8. The damaged truck, whose passengers were hospitalised, was towed away.
1－8的形容詞從句都是由關(guān)系代詞引導(dǎo)而出。另一種形容詞從句是由關(guān)系副詞引導(dǎo)的。這些關(guān)系副詞“where, when, why”相當(dāng)于 “連詞＋副詞”。當(dāng)先行詞是“地點”時，用“where”；是“時間 ”時，用“when”；是“原因”時，用“why”。例如：
9.This is the hotel where many tourists like to stay.
10. May I know the time when the assignment must be handed in?
11. You have not given David any good reason why he should employ you.
形容詞從句分兩款，即限制性的（restrictive/ defining）和非限制性的（non-restrictive/ non-defining）。
限制性形容詞從句對先行詞很重要，因為它所提供的資訊令先行詞突出，容易辨別。例如：
12. A doctor is a person who cures patients.
13. A library is a place where people study.
如果把這兩個形容詞從句除掉，它們的先行詞的形象就立刻模糊起來。
非限制性形容詞從句并未顯得那么重要，因為它只給先行詞增加些額外的修飾品；這些附屬品，有固然好，沒有也無傷大雅，不會對先行詞已經(jīng)明確的身分起不良影響。這種從句要用逗號和先行詞隔開。例如：
14. NUS, which turns out a variety of scholars, is a world-famous university.
15. Jason's latest book, which came out last month, has been well-received.
當(dāng)限制性形容詞從句以賓格出現(xiàn)時，里面的關(guān)系代詞“whom, which, that”可以省略。例如：
15.Do you know the man （whom） Jane is talking to?
Please show me the book （which） you bought yesterday.
The house （that） they are living in will be renovated.
Irene likes the puppy （that） her friend gave her.
Have you visited the gentleman （whom） you met at the airport?
最常見的形容詞從句是由關(guān)系代詞“who, whom, which, that, whose”等引導(dǎo)。這種代詞既是代詞，也是連詞。被“who”和“whom ”所修飾的先行詞（the antecedent）是“人”?！癢ho”是主語格（the nominative case）：“whom”是賓語格（the objective case）：“which”的先行詞是“動物”或“事物”，是主格，也是賓格：“that”是主格也是賓格，可以指“人物、動物、事物”：“ whose”是所有格（the possessive case），可以和“人物、動物、事物”連用。
上述各點都可以從下列例句中反映出來：
1. The boy who is watching TV is my nephew.
2. Do you know the man whom Jane is talking to?
3. The pen which was broken belonged to John.
4. This is the cat which came from Thailand.
5. The gentleman that has just walked past is our new manager.
6. The generation gap is a problem that concerns us all.
7. The principal will speak to those whose performance is not up to the standard expected.
8. The damaged truck, whose passengers were hospitalised, was towed away.
1－8的形容詞從句都是由關(guān)系代詞引導(dǎo)而出。另一種形容詞從句是由關(guān)系副詞引導(dǎo)的。這些關(guān)系副詞“where, when, why”相當(dāng)于 “連詞＋副詞”。當(dāng)先行詞是“地點”時，用“where”；是“時間 ”時，用“when”；是“原因”時，用“why”。例如：
9.This is the hotel where many tourists like to stay.
10. May I know the time when the assignment must be handed in?
11. You have not given David any good reason why he should employ you.
形容詞從句分兩款，即限制性的（restrictive/ defining）和非限制性的（non-restrictive/ non-defining）。
限制性形容詞從句對先行詞很重要，因為它所提供的資訊令先行詞突出，容易辨別。例如：
12. A doctor is a person who cures patients.
13. A library is a place where people study.
如果把這兩個形容詞從句除掉，它們的先行詞的形象就立刻模糊起來。
非限制性形容詞從句并未顯得那么重要，因為它只給先行詞增加些額外的修飾品；這些附屬品，有固然好，沒有也無傷大雅，不會對先行詞已經(jīng)明確的身分起不良影響。這種從句要用逗號和先行詞隔開。例如：
14. NUS, which turns out a variety of scholars, is a world-famous university.
15. Jason's latest book, which came out last month, has been well-received.
當(dāng)限制性形容詞從句以賓格出現(xiàn)時，里面的關(guān)系代詞“whom, which, that”可以省略。例如：
15.Do you know the man （whom） Jane is talking to?
Please show me the book （which） you bought yesterday.
The house （that） they are living in will be renovated.
Irene likes the puppy （that） her friend gave her.
Have you visited the gentleman （whom） you met at the airport?