Form
… + that + Subject + Verb
(‘that’ can often be omitted when it’s the object)
I think (that) you are right.
The problem is that we have no time.
That he passed the exam is a miracle.
Meanings
The most common use of a noun clause.
The clause acts as the object, receiving the action of a verb like know, think, say, believe, wonder, ask.
She said that she was tired.
I wonder why he is late.