be and been

...((( Whether I speak or write English sentenses. I do not know how to use (be and been) Could everybody tell me? . Thank everybody for helping, ))) 尤其這句 Could everybody tell me,,我想說
Whenever I speak English or construct English sentences, I do not know how to use "be/been". Could anybody help me with that, please? Thank you all in advance.
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How to use"be"?
Present tense
Examples:
1) Be confident (adjective)
2) Be happy (adjective)
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1) You are being so mean to me! <---------- to put emphasis on" so mean"
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1) I want to be an English teacher. to +be+ an English teacher( object)
2) I want to be happy. to+ be+ happy(adjective)
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Simple future tense
1) I will be happy. will(modal verb)+ be+ adjective
2) I will be your tutor. will(modal verb)+be+object
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Future continuous/progressive tense
1) I will be having dinner with Helen this evening. ( high possibility)
will( modal verb) + be+ having(verb+ing)
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Present perfect tense
1) I have been to Japan twice. ( your experiences)曾經去過
2) I have been so unhappy lately近來. ( recently) so(adverb) unhappy(adj)
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Present perfect continous tense
1) I have been doing my homework since this morning.
( To start doing my homework this morning and up to now I am STILL doing it.)
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Past perfect continuous tense
1) I was exhausted because I had been lifting weight.
( It is possible that I was still lifting weight at that moment or that I had just finished.)