自己写了一个英语句子,请高手帮忙看有什么语法错误没Yesterday My aunt took two children coming my home,they were poor in mathematics,so I taught them to do a sum they can’t understand it.

coming改作to come，sum 后面再接一个what，最后一个it不要

应该不错吧，注意标点符号

应该说有错：

1. 人 be poor at

2. a sum后接定语从句they can't understand ,定语从句前省略了关系代词 that，所以，it是多余的。

3. take sb coming my home结构不符合习惯

   Yesterday My aunt took two children to my home, they were poor at mathematics, so I taught them to do sums （that） they can’t understand.

Yesterday my aunt come to my home with two of her kids, who were poor in maths and need my help. Therefore, I spent a long time to help them to understand where they had been confused.

Yesterday My aunt took two children coming my home,they were poor in mathematics,so I taught them to do a sum they can’t understand it.
错误1.MY换成my,
错误2.coming my home,换成 to my house,coming做伴随语不顺
错误3.a sum they can’t understand it.语意不通,在sum 和 they 之间加上 but