What is this？ 变为 What are these？What is that？ 变为 What are those？
What is it？变为 What are they？
Who is he？变为 Who are they？
How much is it？变为 How much are they？
It is a pear.变为 They are pears.
This is a pear.变为 These are pears.
That is a pear.变为 Those are pears.
此外，还有一些其他常见的单数变复数规则：
人称代词 I → we you → you she, he, it → they be动词： am → are is → are was → were were → were 指示代词
this → these
that → those
名词：
一般在词尾加 -s 或 -es（例如：book → books, pen → pens）
以 -y结尾的词，变y为i再加-es（例如：baby → babies）
以 -f或-fe结尾的词，变f或fe为v再加-es（例如：knife → knives）
形容词性物主代词：
my → our
your → your
his → their
her → their
its → their
名词性物主代词：
mine → ours
yours → yours
his → theirs
hers → theirs
its → theirs
不定冠词：
a 或 an → 去掉（但在某些固定搭配中可能保留）
这些规则可以帮助你在五年级英语学习中将单数句子正确地变为复数句子。
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