How to determine that whether the noun clause is acting as a complement of the verb or object of the - English - Sentence Phrase and Clause

Question

How to determine that whether the noun clause is acting as a
complement of the verb or object of the verb ?

Asmita Bhaumik · Answer

If there is a vip before the noun clause then it is complement of
the verb

How to determine that whether the noun clause is acting as a complement of the verb or object of the verb ?