英语什么时候 用a 和 an 在词语前答:注意: a. 位于下列形容词之后: such,what,many,half, I have never seen such an animal. Many a man is fit for the job. b. 当名词前的形容词被副词as, so, too, how, however, enough修饰时,不定冠词应放在形容词之后: It is as pleasant a day as I have ever spent. So short a time. ...