Dependent on tense, either.
No. For plural, like are, you can say have been. For singular you would say has been.
No. You would say "It will be helpful" or "It would have been helpful."
We would most likely say 'Bpen Yang Ngai Baang' เป็นยังไงบ้าง Its the colloquial way of saying 'how are you?' or 'how have you been?'
"où avoir vous avez été" is how you say "where have you been" in french.
You have been travelling is correct. You would never say you have been on travelling, although for poetic emphasis you could say you have been travelling on.
You would say the rock has been metamorphized.
When you are in class you my not hard what been say you will ask you tacier what has been saying
Daaa... My desire has been and my desires have been.
You say whats up?
"I have been playing" is "He jugado".
You can say "Ogbe n'ede" in Edo language to mean "It's been a while."
That is correct. You could also say: Tom has been unemployed for a month.