问题描述：
that boy in our class is japanese改成算数句
any,playgrounds,school,in,are,your,there连句
下面的句子有一处错误,改正
they are our maths' teachers.
we must listen our teachers carefully in class.
mr black is jack's and mary's father
any,playgrounds,school,in,are,your,there连句
下面的句子有一处错误,改正
they are our maths' teachers.
we must listen our teachers carefully in class.
mr black is jack's and mary's father
问题解答：
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