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.

1.she is very interested in math.
2.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.
(1. interesting改为 interested
interesting是形容物的 例如 an interesting book
2.去掉with help 后接宾语不用介词
3.去掉but although 和but 不能一起用
可以说 My grandpa is old, but he looks healthy. 或者 Although my grandpa is old, he looks healty.
4.play 改为 playing )
be good at doing sth.擅长做某事 固定用法
O(∩_∩)O谢谢

1. 应该把interesting改为interested
2.the classmate always help each other(不确定）
3. 有了although就不能用but了，这两者不能同用。
4. be good at 后面接的是ing 形式，所以play应改为 playing吧。
很久没学英语了，也不知道给答案是否正确，仅供参加吧。呵呵，希望能对你有一点帮助。

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.

1. interesting改为 interested
interesting是形容物的 例如 an interesting book
2.去掉with help 后接宾语不用介词
3.去掉but although 和but 不能一起用
可以说 My grandpa is old, but he looks healthy. 或者 Although my grandpa is old, he looks healty.
4.play 改为 playing
be good at doing sth.擅长做某事 固定用法