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单词变复数怎样便,请简便回答baseball的复数形式是什么?怎样把thisisabookthatismyparentyesitiswhatisthisisthatyourpencil?把句子变成复数形式、

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单词变复数怎样便,请简便回答
baseball的复数形式是什么?
怎样把this is a book
that is my parent
yes it is
what is this
is that your pencil?
把句子变成复数形式、
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答案和解析
baseball
that are books
yes they are
what are those
are these your pencils