could and would questions are more deferential than the corresponding can and will questions. Ask with could and would with people you don't know very well, or with people who have a higher social standing than you, or with people you don't want to be very direct with, or with people whom you want to show respect for. Ask with can and will with people you are very familiar with, or with people who have the same social standing as you, or with people you want to be very direct with, or in situations that don't require you to show special respect.
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PreciousJonesWhat common words are used to begin a question?There doesn't seem to be a lot of them.Actually there are very many. "How" and the 5 familiar question words beginning with W, and their variants of which there are many, are just some of the question words in English.
Mister MicawberAnd we should not ignore the growing trend of forming a question from a statement just by changing the ending tone: You're going?He's not coming till Tuesday?MacDonald's is still closed?
That's of course true for oral speech. But English students are notorious for writing a declarative statement, putting a question mark at the end, and passing that