【用法歸納】
1.一(個，件，…)：
He had a book under his arm．他手臂下夾著一本書。
He was a boy from a poor home. 他是來自窮苦家庭的孩子。
I saw a girl watering the flowers. 我看見一個女孩在澆花。
Anna had a boy friend named James. 安娜有個男朋友名叫詹姆斯。
He arrived half an hour ago. 他是半小時前到達的。
He is an able man. 他是一個能干的人。
Give him an inch and he will take a mile. 他會得寸進尺。
The book is based on an actual case. 這書是根據(jù)一個實際案例寫的。
He decided to put an advertisement in the newspapers. 他決定在報上登一份廣告。
2.任何…都：
A bird has wings. 鳥有翅膀。
A square has four sides. 正方形有四條邊。
A dog is an animal. 狗是動物。
3.每(一)：
He comes home once a week. 他每周回一次家。
The doctor told him to bathe his eyes twice a day. 醫(yī)生讓他每天洗兩次眼睛。
The ducks were force-fed several times a day. 這種鴨子每天強行喂食好幾次。
4.某，某一個：
A Mr. Black just came to see you. 剛才一個叫布萊克先生的人來看你。
The house next door has been bought by a Mr Jones. 隔壁的房子被一個叫瓊斯的先生的人買下了。
【考點說明】
1. 用 a 還是用an：一般說來，在輔音或半元音開頭的詞前用a，而在元音開頭的詞前用an。注意：有些以元音字母開頭的單詞，由于第一個音不是元音而是輔音，其前仍用a而不用an。
2. 單數(shù)可數(shù)名詞若泛指，其前需加 a / an，不要從漢語習慣出發(fā)，漏掉此不定冠詞，如不能說Her father is famous film poet.(應在is加a)
3.不能與指示代詞、物主代詞、名詞所有格等連用，如不說 my a good friend，可改說 a good friend of mine。
1.一(個，件，…)：
He had a book under his arm．他手臂下夾著一本書。
He was a boy from a poor home. 他是來自窮苦家庭的孩子。
I saw a girl watering the flowers. 我看見一個女孩在澆花。
Anna had a boy friend named James. 安娜有個男朋友名叫詹姆斯。
He arrived half an hour ago. 他是半小時前到達的。
He is an able man. 他是一個能干的人。
Give him an inch and he will take a mile. 他會得寸進尺。
The book is based on an actual case. 這書是根據(jù)一個實際案例寫的。
He decided to put an advertisement in the newspapers. 他決定在報上登一份廣告。
2.任何…都：
A bird has wings. 鳥有翅膀。
A square has four sides. 正方形有四條邊。
A dog is an animal. 狗是動物。
3.每(一)：
He comes home once a week. 他每周回一次家。
The doctor told him to bathe his eyes twice a day. 醫(yī)生讓他每天洗兩次眼睛。
The ducks were force-fed several times a day. 這種鴨子每天強行喂食好幾次。
4.某，某一個：
A Mr. Black just came to see you. 剛才一個叫布萊克先生的人來看你。
The house next door has been bought by a Mr Jones. 隔壁的房子被一個叫瓊斯的先生的人買下了。
【考點說明】
1. 用 a 還是用an：一般說來，在輔音或半元音開頭的詞前用a，而在元音開頭的詞前用an。注意：有些以元音字母開頭的單詞，由于第一個音不是元音而是輔音，其前仍用a而不用an。
2. 單數(shù)可數(shù)名詞若泛指，其前需加 a / an，不要從漢語習慣出發(fā)，漏掉此不定冠詞，如不能說Her father is famous film poet.(應在is加a)
3.不能與指示代詞、物主代詞、名詞所有格等連用，如不說 my a good friend，可改說 a good friend of mine。