英语中有的副词兼有两种形式：一种是与形容词同形；另一种是在该形容词后面加副词词缀ly构成。这两种形式的副词在词义和用法上有一定的差异，有的甚至完全不同。
常见的这类副词有：firm稳固地firmly坚固地direct径直地directly恰好free自由地，免费地freely自由自在地，随便地flat平淡地flatly直截了当地short突然shortly不久even甚至evenly平均地clean完全地，径直地cleanly清洁地，干净利索地clear隔开，不接触clearly清晰地，明显地close近closely紧密地，接近地easy安适地easily容易地dead突然地，完全地deadly死一般地，非常fair公平，正直地fairly相当地hard努力地hardly几乎没有，几乎不most最mostly重要地right还好，适当地rightly改正地，合理地，正确地high高高地highly高度地just正好justly公正地late迟，晚lately最近near近nearly几乎pretty相当地prettily优美地sharp突然地，急剧地sharply严厉地
【例句】
The hawk was circling high in the sky. We spoke highly of him. Don't come too close. I closely resemble my father. The train stopped dead. She turned deadly pale. She is the most beautiful girl in the college. The village is mostly of mud houses. She slipped right to the bottom of the icy mountain. I am rightly informed.
再看几个考题实例：
Fix the post ____in the ground.
A) firmed B) firmly C) firmingly D) firm
答案为D。firmly意味“坚固地，顽固地”，在此句中不妥，firm意为“稳固地，牢固地”，合乎题意要求。句意：把这个桩子牢固地钉在地上。
Communism can never be taken as the equivalent of eating ____and riding____.
A) free; free B) freely; freely
C) free; freely D) freely; free
答案为A。free意为“免费地”，freely意为“自由自在地，不受约束地”。句意：共产主义决不能理解为白吃饭和免费乘车。
A bosom friend afar brings a distance land____.
A) nearby B) nearly C) near D) nearerly
答案为C。nearly是副词，意为“几乎”，不符合题意。此句中的near不是副词，near作副词的意义是“一点也不，远不及”，不符合题意，near是形容词，意为“邻近的，附近的”，正合题意。句意：(挚友在)天涯若毗邻。
The desk was ___in the center of the room.
A) direct B) directed C) directing D) directly
答案为D。题意：书桌刚好在屋子中央。
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