Question

He is proud of his knowledge (noun form proud)

Answer 1

He takes pride in his knowledge.

• The word 'proud' is an adjective,i.e. used to add an attribute to a noun.
• The noun form of proud is 'pride'.
• The sentence is in the simple present tense and we need to keep the tense same.
• The subject here is singular and so has been followed by a singular verb 'takes'.
• The phrase 'takes pride in' is used to refer to being proud of something.

Answer 2

Answer:

He takes proud in his knowledge.