You will note that most frequently the noun clause used as subject of the verb is introduced by the subordinate conjunction that.
When the subordinate clause is used as a noun it is called a noun clause.
In each of these groups a noun (agreement, victory, etc.) is replaced by an infinitive, by a noun clause.
A noun clause may also be used in apposition to a noun to explain its meaning.
A noun clause may be used in any way in which a noun is used, except as a possessive.
A noun clause may be used as the direct object of a verb ( 386).
In all of these sentences, the noun clause is used as the subject of the verb.
Thus it is plain that him to go is also a noun clause, of which him is the subject, and to go the predicate.
In the first two examples, the noun clause is the subject; in the last two, it is the object of a verb (feared, expect).
A noun clause may be used as the retained object of a passive verb ( 253).
a subordinate clause that functions as a subject within the main clause
An example of a noun clause is: What the lady does is none of your business.