A large number of... - singular or plural?

  1. “a large amount of —” (e.g. sugar, money, water etc.)
  2. “a large number of —” (e.g. students, people, houses etc.)

I know the sentence1 is for uncountable noun, so it takes a
singular-form verb however,
the sentence2 is for countable noun, Does this take a singular-form verb or plural-form verb??

Thank you!

P.S. What is “The large —” insted of “A large —”?

Thought I just asked it. Answer is in the other threat titled “singular or plural (a cluster of grapes)”.