Are all uncountable nouns without plural? Can uncountable nouns be modified with are

Are all uncountable nouns without plural? Can uncountable nouns be modified with are

I agree with you
In addition, there are several points
1. Collective nouns: family, class, police, cattle, clothing, jewelry
The verb is singular
It expresses individual concept and plural predicate verb
The class has elected its leader.
The class elected its monitor
The class are interested in his lecture.
All the students in the class are interested in his lecture
2. Uncountable nouns with singular and plural forms
1) Uncountable nouns generally have no singular or plural, but material nouns can have singular or plural when they represent different categories, such as tea, a tea, etc. common words of this kind include fruit, food, coffee, etc
2) Abstract nouns can also be plural when they refer to concrete things
They all mean "some kind of person, verb or thing"