quick 和 quickly 均可用作副词表示“快”，quick的副词用法多见于口语中，并且总是放在动词之后（此时也可以用 quickly）。如：
Come quick(ly). There’s been an accident. 快来，出事故了。
I’ll get back as quick(ly) as I can. 我会尽快回来。
若放在动词之前，一般要用quickly。如：
He quickly changed his clothes. 他迅速地换了衣服。
He quickly turned about and walked away. 他一个转身就走了。
She quickly freshened her make-up. 她迅速地重新化了妆。
