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小博士：细心的同学们肯定发现了有些名词有单数(singular)和复数(plural)两种形式，而有些名词只有单数形式，这是怎么回事呢？让我来告诉你吧。英语中，名词按其所表示的事物的性质，可分为可数名词(countable noun)和不可数名词(uncountable noun)，可数名词有复数形式，不可数名词一般没有复数形式。名词单数变复数的变化规则见下表。
比一比，看谁写的单词多！
1 直接加-s的单词有：________________________________.
2 加-es的单词有：___________________________________.
3 变y为i再加-es的单词有：__________________________.
4 不规则变化的单词有：_______________________________.
查看习题详情和答案>>句型转换（5%）
1.These are my grandparents. (变一般疑问句)
_______ these ______ grandparents?
2.Is this his picture? (作肯定回答)
_______, ______ is.
3.The tape player is in the room. (对划线部分提问)
_______ ________ the tape player?
4.She is a nice girl. (单数变复数)
_______ are nice ______.
5.They are erasers. (复数变单数)
______ is _____ eraser.
查看习题详情和答案>>
句型转换（5%）
【小题1】These are my grandparents. (变一般疑问句)
_______ these ______ grandparents?
【小题2】Is this his picture? (作肯定回答)
_______, ______ is.
【小题3】The tape player is in the room. (对划线部分提问)
_______ ________ the tape player?
【小题4】She is a nice girl. (单数变复数)
_______ are nice ______.
【小题5】They are erasers. (复数变单数)
______ is _____ eraser.