以-s-x-sh-ch结尾的名词后加-es
-es读作/iz/
class-classes
brush-brushes
以辅音字母加y结尾的词变y为 i加es
-ies读作/iz/
party-parties
factory-factories
以-o结尾的名词加s或es
- s或-es读作/z/
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七年级英语上册Unit 4教案