"go to a bank" is about one third as common as "go to the bank".
Which means? Nothing, as far as I can see.
Doesn't agree with the examples. In most cases 'go to a bank' could be changed to 'go to the bank' with no change in meaning.
Do you mean "no change in
literal meaning"? If so, I agree.
But...
go to:
school (the action of studying)
the bathroom (the action of ...)
the bank (the action of transacting financial business)
the bus stop (the action of taking a bus)
*a bank/school/bathroom/bus stop (the place/thing itself)
I must go to the toilet = poilte way of saying "I need a dump" (single action )
I must find a toilet = find the place to have a dump. (two actions)
Compare:
I needed the toilet. (943 English pages for "I needed the toilet".)
I needed a toilet. (95 English pages for "I needed a toilet".)
25,600 English pages for "I need to go to the bathroom". = I need a dump, etc."
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