He couldn't find a teacher_____（teach）to play the piano

He couldn't find a teacher_____（teach）to play the piano
He couldn't find a teacher_____（teach）to play the piano

He couldn't find a teacher_____（teach）to play the piano
若没有特别要求,以上二答案应都可以.但我认为to teach him
“动词不定式表目的和表将来之意”较好.