找出下列句子的错误1.she is very interesting in math.（还有三道题如下）
问题描述：
找出下列句子的错误1.she is very interesting in math.（还有三道题如下）
2.The classmates always help with each other.
3.Although my grandpa is old,but he looks healthy.
4.My elder brother is very good at play the piano.
答
1.she is very interested in math2.The classmates always help each other.3.Although my grandpa is old,he looks healthy.4.My elder brother is very good at playing the piano.