They are apple tree.改为单数
These are apple trees(改为单数句)
they are waitresses(改为单数
they are apples改为单数
They are oranges 改为单数
They are apple改为否定句
they aren't apple trees.改为单数句?
here are some apple for you改为单数句
they are English books.(改为单数形式)
They are his friends改为单数形式
they are orange sweaters 改为单数句
They are Chinese【改为单数形式】
are they apples?改为单数形式