1、aloud常用在读书和说话上,通常放在动词后.常见搭配：read aloud朗读.修饰cry,shout,call等动词时意为“大声的”.aloud也可表示“出声地”,但loud,loudly无此意.如：The teacher asked him to read the text aloud.老师让他大声地朗读课文.
2、loudly是副词,意为“大声地,吵闹地”.可指人声、敲门声或其他各种声音,强调声音高、喧闹、不悦耳.如：They are arguing loudly.他们正在大声争辩.
3、loud 作副词时意为“大声地”,主要指说话声和笑声,常用比较级形式.如：Please speak a little louder.说话声音再大一点儿.
loud还可以用作形容词,意为“大声的,响亮的,吵闹的”.如：The music is too loud.音乐声音太大了.
