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(3)行为动词的几种变化形式：
规则动词：
Enjoy(原型)enjoys(第三人称单数)enjoyed(过去式)enjoyed(过去分词)enjoying(现在分词)
不规则动词：
A-A-A型：put-put-put bit-bit-bit read-read-read
A-A-B型：beat-beat-beaten
A-B-A型：come-came-come run-ran-run
A-B-B型：bring-brought-brought buy-bought-bought
Dig-dug-dug feed-fed-fed feel-felt-felt
A-B-C型：begin-began-begun blow-blew-blown
wear-wore-worn
情态动词及助动词：can-could/may-might/shall-should/will-would
(4)现在分词的变化方法
直接在动词的后面加ing. work-working do-doing
以e结尾的去e加ing. write-writing like-liking
重读闭音节双写最后的辅音字母加ing. swim-swimming; dig-digging; hit-hitting
注意：lie-lying; die-dying
(5)词语辨析
A. look, see, watch, read
Look:看，强调看的动作。Look at the bird.
See:看见，强调看的结果，see a film
watch:观看，指特别留意，感兴趣的看。watch TV
read:读，阅读 read a book
B. say, speak, talk, tell
Say：可作及物动词，也可作不及物动词，它的含义是“说”、“说明”、或“表达”(思想、感情)。
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