a/an的用法语法名词单数变复数a和an的用法区别:1.a用在以辅音音素开头的单词前。例如:abook,adesk,ateacher,astudent2.an用在以元音音素开头的单词前。例如:anegg,anapple,anEnglishteacher,anoldcar/man/womana/an被称作不定冠词,用在单数可数名词前,表达某一个人或事物中的一个,相当于汉语的“一”,但不强调数目概念。a/an用法的区别:用a/an填空。1.Ihave________goodfriend.2.Shehas____________apple.3.Pleasegiveme________MP4.4.MissZhangis_______Englishteacher.5.It’s_____desk,andit’s____olddesk.6.Hewantstobuy___penand____eraser.7.Thereis______UFO.8.Thereis_____“d”and_____“s”intheword“desk”.aanananaanaanaaan你能归纳出26个字母哪些用a,哪些用an吗?anaABCEFGHIJKLMNOPQRSTUVWXYZD总结:常见用an的单词有:eggeraserappleorangeMP4