A small room with too much furniture is very crowded.

Is it correct grammar?
Jenny chiu many furniture or much furniture?



Yes I believe it is too 'much' furniture. Furniture is an uncountable noun.
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 CalifJim's reply was promoted to an answer.

Much furniture

How much or how many furniture

Students: Are you brave enough to let our tutors analyse your pronunciation?

furniture is an uncountable noun.

We say much furniture, not many furniture. eg How much furniture does she have?

If we must count, we say eg She has five pieces of furniture.