NOUN CLAUSES

A noun clauses is an entire clause which takes the place of a noun in another clause of phrase. Like a noun, a noun clause acts as the subject or object of a verb of the object of a preposition. Answering the questions “who “ or “what”.
Noun clauses are very often introduced by that are, therefore often called that-clauses. However, not all noun clauses are that-clauses. That-clauses are possible after a large nimber of verbs.
Some of the most usefuls are given below :

Acknowledge
Admit
Advice
Agree
Allege
Announce
Appear
Arrange
Ask
Assure
Beg
Believe
Command
Cobfess
Consider
Declare
Decide
Demand
Demonstrate
Determine
Discover
Doubt
Estimate
Expect
Fear
Feel
Find
Forget
Guarantee
Happen
Hear
Hope