Are many people speaking more than one language?
Are families getting bigger or smaller these days?
Would people be happier 20 years ago? Grammatically correct for a particular context; also could be : Were people happier 20 years ago?
Would people work harder nowadays? Again, correct for a particular context; also could be Do people work harder nowadays?
Do people spend a lot of time watching tv these days?
Do women do less housework than they used to?
What sort of things do people do on national holidays?
How did people celebrate on 31 December 1999?