1. What material can i obtain to teach/practice correct english usage for teenage school student? Ideally i am after purchasable audio media or a instructor to provide training locally in the uk.
2. What is the full meaning and significances of intransitive verb?
It would help to know where you are in order to suggest what materials you can get.
Re Intransitive verbs - see here: https://www.usingenglish.com/glossar...tive-verb.html