请问这个句子对吗?语法有没有错?急!

问题描述:

请问这个句子对吗?语法有没有错?急!
I'm interest in English since I study it.

有错误
I have been interested in English since I began to study it.
1.since 后面的从句应该用过去式
2.它的主句应该用现在完成时
3.be interested in sth