fast的副词形式是fast还是fastly

fast 既是形容词又是副词 没有fastly这词;

fast

adj.快的;迅速的;敏捷的;迅速发生的;立即发生的;动作迅速的;

adv.快;快速;迅速;不久;立即;牢固地;完全地;

v.节食;禁食;斋戒;

n.禁食期;斋戒期

Research indicates that eating habits are changing fast.

研究显示，饮食习惯正迅速改变。

Things are not moving as fast as we hoped.

事情的进展不像我们希望的那么快。

The water was rising fast.

水迅猛上涨。

He\'s going too fast.

他走得太快。

She is on the fast track to promotion.

她现在升迁在望。