a和an的用法口诀:不定冠词a和an,a后辅音an后元,泛指一类或一个,表数语气比one弱,序数词前表又再,most前意非凡,抽象物质动变名,化为具体用法灵,用错a、an被人笑,单名泛指被丢掉,指代物代所有连,位置放错更无颜。
不定冠词有两个,a和an,a用在辅音开头的单词前面;an用于以元音开头的单词前。
a bit一些;
a body of一片,大量;
a bolt from the bottle晴天霹雳;
a bottle of一瓶;
a change for the better好转;
a close game势均力敌的比赛;
a couple of两个;
a drop of一滴;
a far cry悬殊;
take an example举例,示范;
take an exam参加考试;
have an effect/influence on(对…)有影响;
have an advantage over胜过,比…优越;
keep an agreement遵守协议;
keep an appointment守约;
keep an eye on留意,照看;
cover an area of占地…