手机短信验证
a 与 an 的用法区别
1.基本区别：原则上说，a用于辅音前；an用于元音前。辅音前用a的例子如: a book, a student, a school, a house, a magazine 等；元音前用an的例子如: an egg, an apple, an object, an idea, an ugly thing 等。
2.易错说明：hour, honest, honor 等单词的拼写虽然以辅音字母h开头，但其读音却以元音开头，因此，前面要用an。反过来，有些单词虽然以元音字母开头，但其读音却以辅音开头，那么它们的前面应用a而不是an，这些词常见的有useful, university, usual, European, united, one-eyed, one-way 等。
此外，对于数字、字母以及由单词首字母构成的缩略词，其前到底是用a还是an，也需根据读音来确定，如下：
He has an 11-year-old daughter.
Our daughter sent us an SOS for some more money.
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冠词在句中的位置
1. 通常位置：一般说来冠词放在单数可数名词之前(如 a man / the man)，如果名词有其他定语，不定冠词应放在定语之前(如a good man / the good man)。
2. 特殊位置：在下面情况中，冠词的位置比较特殊，需要注意。
① 单数可数名词被 such, many, half, what 等修饰时，不定冠词应置于其后，这个大家看例子就很容易明白，而且平时基本不会出错。
He arrived half an hour ago.
He couldn’t afford to pay such a price.
② 单数可数名词前作定语的形容词被 as, so, how, too 修饰时，通常采用 “as / so / how / too + 形容词 + a / an + 名词”这样的词序。
He didn’t know how great a mistake he had made.
It is too difficult a job for me to finish in so short a time.
③ 当定冠词与 all, both, half 表倍数的 double, twice, three times 等分数词等一起修饰名词时，定冠词应放在它们之后。
Turn off all the lights before you go to bed.
Everything was almost double the normal price.
单句语法填空
1. Instead,she is earning ￡6,500 aday as __ model in New York.
2. For Pahlsson, its return was __wonder.
3. Giveyour body and brain a rest by stepping outside for __ while, exercising, or doing something you enjoy.
4. Thenursery team switches him every few days with his sister so that while one is being bottle¬fed, __other is with mum — she never suspects.
5. The adobe dwellings (土坯房)built by the Pueblo Indians of the American Southwest are admired by even__most modern of architects and engineers.
6. He owned___farm, which looked almost abandoned.
7. She apologized for the mistake and gave us a spare VIP room on___ top floor.
8. Now,years later, this river is one of____ most outstanding examples of environmental clean up.
1.解析：a 此处意为“作为纽约的一名模特”，在单数可数名词model前应该使用不定冠词a，表示“一，一名”。
2.解析：awonder表示“奇迹，奇事”时为可数名词，此处为泛指，故要用不定冠词a。
3.解析：afor a while为固定搭配，意为“一会儿”。
4.解析：the 此处表示双胞胎大熊猫中的另一只，两者之间的“另一个”应该使用the other。
5.解析：the 在形容词最高级的前面用定冠词the。
6.解析：a 此处指一个农场，表示泛指，故用不定冠词a。
7.解析：theon the top floor为固定搭配，意为“在顶层”。
8.解析：the 此空后面的“most outstanding”是最高级的形式，故应填定冠词the。
