不定冠词a和an是用于单数可数名词前,对名词起限定作用的一种虚词,表泛指,即表示所说的人或物对听者或读者来说可能是不明确的。a用在读音以辅音音素开头的单数可数名词或字母前,an用在读音以元音音素开头的单数可数名词或字母前。
He was an orphan and lived with his uncle.
他是个孤儿,和他叔叔一起生活。
Uncle Harry is terminally ill with cancer.
哈里叔叔癌症已到了晚期。
I don't have much contact with my uncle.
我和叔父甚少联系。
I'm going to visit my uncle.
我要去看我舅舅。
My uncle's branch of the family emigrated to Canada.
我们家族中我叔父的这一支移居到了加拿大。