Can anybody answer these at least as muc

The difference between or when we should use these words
“A” and “The”
“FOR” and “TO”
“Go” and “goes”
While and during
Told, speak and said
Then and Than or Then only and Than only
Made and make
That or Which
When do we use these words “DO” “AS” is used
Has and does?
May be and Might be
Could would and should
All though and even though
To the office OR for the office which one is the correct?

Is there any rules to use or when should we must use these words
IN, ON, ACROSS, FOR, TO, AROUND, ABOUT, OF, BY AND OVER: overthere but not that completed: over)
Please reply to rajeshhenjarappa@yahoo.co.in
I will be waiting for your reply bye