slow用作副詞時，通常只和少數(shù)動詞（如go,drive,pass,run,climb等）連用，且必須置于其后。slowly用作副詞時，其位置比較靈便。

slow(用于非正式英語中)緩慢地，慢吞吞地。

1)通常只與go,run,walk,drive等少數(shù)動詞搭配,其比較級是slower。例如

My watch runs slow. 我的表慢了.

How slow this train goes! 這列火車開得多慢啊!

Tell the driver to go slower.告訴司機開慢些。

2)slow還可以與分詞構成復合詞。如：slow-cooked food用文火烹調的食物

3)習語：go slow(指工人)怠工；減少活動。

You ought to go slow until you feel really well again.

你應該減少活動，直到真正康復以后再說。

slowly可用于各種情況,置于動詞前或后，其比較級是more slowly。例如:

walk/speak/learn/react slowly 走、說、學、反應得慢

She slowly opened the door. 她慢慢地打開門。

He did everything very slowly. 他無論做什么事都是慢騰騰的。

Would you please say that again more slowly? 請你更慢地重復一遍，好嗎？