11. aim → __ aimless (漫无目标的) 12. stain→ stainless (无瑕疵的)
1.Many children were left homeless（home）after the earthquake.
2.I think the reasons he gave for his being late are __ (un) acceptable (accept).
3.A worldwide financial (finance) crisis broke out in 2008. 4.It is an _ honorable (honor) thing to give a speech here.
5.Her _ selfless （self）devotion to education left a deep impression on us.
6.Everyone is _ responsible (response) for his own behavior. 7.After many years’ hard work，he now lives a comfortable（comfort）life.
8.Doing exercise is _ beneficial（benefit） to our health. 1.-ant，-ent
注意：一般来说，这些词相应的名词都是把t改成ce。 important 重要的→importance n.重要性 distant 遥远的 →distance n. 距离 different不同的→difference n. 不同之处 intelligent有才智的→ intelligence n智力 2.-ual
注意：这类词一般的副词形式都是后-ly
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actual adj.→ actually adv. 实际上 equal adj.→ equally adv. 同样地 usual adj.→ usually adv. 通常 3.-ar
如：similar相似的, popular流行的, regular有规则的
注意：这些词一般都有它的名词形式-ity。如：similarity相似性，popularity流行等。 4-ary,-ory
如：necessary必要的, literary文学的，compulsory义务的，contradictory相互矛盾的等 5.-ate
如：fortunate幸运的，accurate准确的，appropriate适当的等。 6.其他
除以上这些较常见的词尾之外，还有一些是前面已经提到过的后缀在很多单词中也是做形容词的词尾，如：-ous，-ive，-ial等。 anxious 焦虑的 cautious 谨慎的 passive 被动的，消极的 decisive 决定性的
special 特别的 initial 最初的 一、按要求改写下列单词。 abundance n.→abundant adj.丰富的 elegance n. →_ elegant adj.优雅的
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patience n. →_ patient adj. 耐心的 silence n. →_ silent adj. 安静的 annually adv.→annual adj.每年的 casually adv. →_ casual adj. 随便的 二、选词填空。
1. We should have positive attitudes towards our studies. (positive, negative)
2. Will it be convenient for us to start work tomorrow? (convenience, convenient)
3. Things __ gradually improved. (gradual, gradually) 4. The airport is about ten miles __ distant from the city. ( distance, distant)
5. He devotes himself to some _ voluntary work whenever he has free time.（volunteer，voluntary）
6. The children sleep in their __ separate beds.（separate，separated） 7. I’m not going to tell you about it；it’s _ private.(private, privacy) 8. Those students were quite curious about the origin of mankind. (curious, serious)
Unemployment has become one of the most serious social problems. (social, society)
a．It was obvious to everyone that the child had been badly treated. b．_ Obviously，the child had been badly treated.（obvious，
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obviously）
-(e)n使成为，引起，使有 (1)某些形容词后-(e)n
weak →weaken(使)虚弱，减弱 short→ shorten缩短 sharp→ sharpen(使)变锋利,明朗 (2)某些名词后-(e)n
fright→ frighten（使）惊吓 length→ lengthen加长 strength → strengthen加强 2. –(i)fy 使??化，使成
beauty→ beautify美化 pure→ purify提纯
simple →simplify使简 quality→ qualify取得资格（或学历） class →classify.分类
3. –ize/-ise 做成，变成，??化
real→ realize意识到 organ→ organize组织
apology →apologize道歉 modern→ modernize使现代化 normal→ normalize 使正常化
4. –ate 动词词尾，名词形式常为“-ation” decorate 装饰 communicate 交流 accumulate 积累 compensate 补偿 一、用括号内所给单词的正确形式填空。
1. Nothing could _ weaken (weak) his resolution to continue. 2. Her name’s Katherine, generally _ shortened (short) to Kay.
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