"A large number of people like Chinese food." a (large) number of + countable plural noun + plural form of verb "A large amount of time is wasted every day on mobile phones." a (large) amount of + uncountable singular noun + singular form of verb "A large part / proportion of (the) time / the minutes I spend answering Italki questions is worthwhile" a (large) part / proportion of (+ the) + any noun (singular or plural) + singular form of verb There are some other structures but, in my view, these should cover most situations.