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①表示某一类人或事物中的个体要在名词前加a(an)。例如:? Your mother is a nurse. 你妈妈是一名护士。? Please pass me a chair. 请递给我一把椅子。? A child needs love in his early life1.?一个孩子在早期生活中需要关爱。? ②用来指某人或某物,但不具体说明是谁或是什么时,名词前加a(an)。例如:? A visitor2 called me up just now.?一位游客刚给我打了个电话。? He borrowed3 a dictionary4 yesterday.?他昨天借了一本词典。? A book can help you understand the world.?书可以帮助你了解世界。? ③用来表示“一”的概念,但数的概念不如one强烈。例如:? The cage5 is about a metre6 high, a metre wide7.?这个笼子有一米高,一米宽。? An old man is waiting for you.?一位老人正在等你。? Here is a present for you. 送给你一件礼物。? ④表示单位、数量、长度等。例如:? I write to my pen?friend once a month.?我每月一次给我的笔友写信。? Take this medicine8 three times a day.?这药一天吃三次。? My uncle gave9 me a thousand pounds10 last time.?上次我叔叔给了我1000英镑。? ⑤用在专有名词前,表示说话者不知道的人或事物。例如:? A Mr Black rang you up just now.?一个名叫布莱克的人刚才给你打过电话。? A Li is looking for you. 一位姓李的人在找你。? A Miss Chen borrowed money from me.?一位姓陈的女士借过我的钱。? ⑥在月份、星期及morning, afternoon, evening, night等名词前有修饰语时,一律用a(an)。例如:? on a cold morning在一个很冷的早上? in a sunny Sunday 在一个晴朗的星期天? in a hot month 在一个很热的月份? on a terrible11 night 在一个可怕的夜晚? ⑦与表示职业、身份等的名词连用时,常常不将“一”翻译出来。例如:? The boy wants to be an engineer12 when he grows up.?这个男孩长大后想当工程师。? Are you a doctor or a nurse? 你是医生还是护士?? Is your grandfather interested13 in a foreign14 language15??你爷爷对外语感兴趣吗?? ⑧用在“such16 a(an)…”、“quite a(an) …”、“many a(an) … ”、“rather17 a(an) …”与“so+形容词+单数名词”的结构中。例如:? It is such a tall tree. 这棵树很高。? Many a man comes to work on the farm.? 许多人来这家农场劳动。? She is rather a painter18. 她真是个画家。? ⑨用于what引导的感叹句中。例如:? What a cold day it was19 yesterday!?昨天真是一个大冷天!? What an interesting picture it is!?这是一幅多么有趣的画!? What a difficult problem20! 多难的题啊!? ⑩用于某些固定搭配中。例如:? a few21 一些,少数几个 a bit22 一点儿? a lot(of) 许多,大量 a little 一点儿?a piece of 一片/块……have a cold 得感冒? have a meal23 吃顿饭 have a rest 休息一下? have a good time 过得愉快;玩得高兴?have a swim 游泳have a walk 散步 点击收听单词发音
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