Both are proper ("correct" ) sentences, the first means that the existance is continuing to be diminished, the second means that it happened in the past but the process is not continuing now.
It depends how you use it. If you use it after something it can be correct. But being in a sentence by itself isn't correct.
Being able is the correct version of the sentence. You can use it as a fragment of any sentence.
a correct sentence
Yes, but a better sentence is "She dislikes BEING lied to."
"Thank you for being so patient." That is correct.
am is are was were be been being
No, the correct way to say it is "be a human being."
Technically neither one is incorrect. It is more grammatically correct to use this sentence; He felt he was being mistreated.
The use of the word in the sentence you quote is in the sense of having been perceived as being rude to an elder. So yes, the sentence is correct.
The sentence is not correct as it contains grammatical errors. A clearer version would be: "You are very upset about not being selected for the workshop." This revision uses the correct preposition ("about") and adds "being" to make the structure grammatically correct.
Yes, that is correct!
The correct phrase is "On the same plane". A plane in this case being a level of development, existence, or achievement.