单数句变复数句,复数句变单数句.It is a bus____________________

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单数句变复数句,复数句变单数句.It is a bus____________________

单数句变复数句,复数句变单数句.It is a bus____________________
单数句变复数句,复数句变单数句.It is a bus____________________

单数句变复数句,复数句变单数句.It is a bus____________________
they are buses

They are buses.

They are buses.
it--they
is--are
bus-buses
以s. sh. ch. x 结尾的名词,变复数在词尾加es。