必须要有主语的.
I /You / We have to take piano course.
She /He has to take piano course.
如果是一般过去时的话,把have/ has 换成had
不得不上钢琴课用英语怎么说?
必须要有主语的.
I /You / We have to take piano course.
She /He has to take piano course.
如果是一般过去时的话,把have/ has 换成had