日语
韩语
法语
德语
西班牙语
意大利语
阿拉伯语
葡萄牙语
越南语
俄语
芬兰语
泰语
一、冠词
[误]: What an useful book he has bought!
[正]: What a useful book he has bought!
冠词a用于辅音音素（音标）前, an用于元音音素（音标）前，又如:half an hour（半个小时）; an honest boy（一个诚实的男孩）;a university（一所大学）。
[误]: A teacher is giving a lesson in front of the classroom.
[正]: A teacher is giving a lesson in the front of the classroom.
