they are go to school on foot.为什么不对,为什么要用they are going to school on foot.

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they are go to school on foot.为什么不对,为什么要用they are going to school on foot.

they are go to school on foot.为什么不对,为什么要用they are going to school on foot.
they are go to school on foot.为什么不对,为什么要用they are going to school on foot.

they are go to school on foot.为什么不对,为什么要用they are going to school on foot.
一句话中的“时态”是根据动词的形式而决定.
they go to school .现在时
they are going to school (be动词+现在分词=>进行时)
are go 不能两个动词连着使用.