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動名詞作定語往往表示被修飾詞的某種用途。如：
a walking stick =a stick for walking=a stick which is used for walking
a washing machine=a machine for washing=a machine which is used for washing
a reading room=a room for reading=a room which is used for reading
a measuring tape=a tape for measuring=a tape which is used for measuring
sleeping pills=pills for sleeping=pills which is used for sleeping
動名詞作定語時，在句子中通常有兩個位置：如果是單個的動名詞作定語，常放在被修飾的名詞前面作前置定語;如果是動名詞短語作定語，則放在被修飾名詞的后面，作后置定語。
1.動名詞作定語，說明被修飾詞的性質(zhì)、特征或用途。如：
He may be in the reading room.
他可能在閱覽室里。
They set up an operating table.
他們搭起一個手術(shù)臺。
2.動名詞作定語，表示其與被修飾詞之間為主動關(guān)系，并且表示動作正在進行。如：
There are about 200 students studying in this school.
大約有200個學(xué)生在這個學(xué)校學(xué)習(xí)。
Who is the woman talking to our English teacher?
正在和我們英語老師談話的那個女人是誰?
3.有些動名詞已經(jīng)轉(zhuǎn)化成了形容詞，常用作定語修飾物，表示“令人……”：exciting, shocking, puzzling, confusing, disappointing, discouraging, boring, tiring, moving, touching, interesting, satisfying, frightening, amazing等。如：
That must be a terrifying experience.
那肯定是一次可怕的經(jīng)歷。
The experiment was an amazing success.
那實驗是一個驚人的成功。
注意：如果動名詞與被修飾詞之間是被動關(guān)系，就要用它的被動式being done，通常表示正在被做，常作后置定語。如：
The tall building being built now is our new school.
正在被修建的那建筑是我們的新學(xué)校。
That question being discussed was presented by the headmaster.
正在被討論的那個問題是校長提出來的。