Help. i need your kind corporation?

dear sir's and ma'ams my name is imran qureshi and i'm a just a student and i'm preparing for my examination and so far is going good. my main problem i'm not damn perfect in engish and i really want to be perfect in this language so whenever i find any difficulties i ask about them on yahoo answer my first problem is want to know about how to we use
got to
shall
and one third thing is (be+ing) these are some sentences i have written below so mind helping me
i will be going
we should be going there
you going to be running
so what is the mean of (be+ing) mind explaining it thank you so much

got to = 'have to' or 'need to'
I have got to get to the bank before it closes.
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shall = 'will'
I shall be coming to your holiday party.
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being = 'acting' (being actually has a few meanings)
That person was being mean to me.