0 used mainly in negative sentences and questions and with "too", "so", and "as" to mean "a large number of": --
I don't have many clothes.
I've met him so many times and I still can't remember his name!
If there are only five of us going to the concert, then I've booked one too many seats.
If there were as many women as there are men in parliament, the situation would be very different.
As many as (= the surprisingly large number of) 6,000 people may have been infected with the disease.
There are already twelve bottles of wine, so if I buy as many again (= another twelve bottles) we'll have enough.
A good/great many people who voted for her in the last election will not be doing so this time.
She had five children in as many (= in the same number of) years and decided it was enough.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.