we are singing in the classroom是什么句型

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wearesingingintheclassroom是什么句型wearesingingintheclassroom是什么句型wearesingingintheclassroom是什么句型孩子,这是正在

we are singing in the classroom是什么句型
we are singing in the classroom是什么句型

we are singing in the classroom是什么句型
孩子,这是正在进行时态的陈述句.