How to use "Be" in sentence

Be:

Present - am, is, are

Past - was, were

Past participle - been

Present:

I am a teacher

He is a student

They are players

Past:

I was at home

They were inside the mall

Future:

I will be there in 5 minutes

She will be a teacher next year


Past participle:

I have been in London for two months

I had been in London for two months

Where have you been these times?

I should have been there

I could have been there

I would have been there

I might have been there