问题描述：
单复数转换 急死了啊
this is her uncle.
that is my sister.
is that a photo?
is she your aunt?
no,she isn't.
is it a pencil sharpener?
yes ,it is.
are these oranges?
are those his friends?
are they tom's daughters?
this is her uncle.
that is my sister.
is that a photo?
is she your aunt?
no,she isn't.
is it a pencil sharpener?
yes ,it is.
are these oranges?
are those his friends?
are they tom's daughters?
问题解答：
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