Como dizer "Ter / não ter didática para ensinar" em inglês

Português: ter didática para ensinar, não ter didática para ensinar, não ter muita didática para ensinar
Inglês: be very good at teaching, not be good at teaching, not be very good at teaching

Exemplos:

1. Stephen is a very patient driving instructor. He has taught me very well and his method of teaching is easy to follow. He is very good at teaching.
2. My teacher is not good at teaching. Someone who is able to teach a subject is better suited for us than someone who can do math but isn't good at teaching.
3. Some of the teachers though, like any college, are not very good at teaching, so you just need to know who to look out for.