句子：I am think about this questions with my teacher.
解析：错误在于动词时态和主谓不一致。正确的句子应该是：I am thinking about this question with my teacher.
句子：Because he buys a new boll, so he feel better.
解析：错误在于使用了不正确的单词和语法结构。正确的句子应该是：Because he bought a new ball, he felt better.
句子：He like eat ice-cream but he borther don&39； t like it.
解析：错误在于动词时态、主谓不一致和拼写错误。正确的句子应该是：He likes to eat ice-cream but his brother doesn't like it.
请根据这些解析检查你的作业，并作出相应的更正。