Student or Learner
When use be able to
Welcome to the forums.
Do you mean "When can I use 'be able to'?" = You will be able to use English to talk to people when you have learned it. >> Once you have learned English, you will have the skill to talk to people in English
You are able to read now. >> You have the skill of reading now
She was able to go to the cinema last night. >> She had the opportunity of going to the cinema