nine days, the ninth day

I practice the song.

私は歌を練習します

I practice the song with my teacher.

私は先生と歌を練習します

I practice the song with my teacher in the classroom.

私は教室で先生と歌を練習します

I practice the song with my teacher in the classroom after lessons.

私は授業の後に教室で先生と歌を練習します

I practice the song with my teacher in the classroom after lessons for nine days.

私は九日間授業の後に教室で先生と歌を練習します