妹
My younger sister learns.
妹が習います
My younger sister learns the piano.
妹がピアノを習います
My younger sister learns the piano in the classroom.
妹が教室でピアノを習います
My younger sister learns the piano in the classroom on Saturday.
妹が土曜日に教室でピアノを習います
My younger sister learns the piano in the classroom with her friend on Saturday.
妹が友達と土曜日に教室でピアノを習います