oxford_guide_to_english_grammar

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Noun clauses
260 Summary
Introduction to noun clauses • 261
A noun clause begins with that, a question word or if/whether.
Joanne remembered that it was Thursday.
I can't imagine where Peter has got to.
No one knew if/whether the rumour was true.
We can sometimes leave out that.
I hope (that) everything will be OK.
Patterns with noun clauses • 262
Noun clauses come in these patterns.
As object
I noticed that the door was open.
As complement
The idea is that we take it in turns.
As subject
That he could be mistaken didn't seem possible.
With the empty subject it
It didn't seem possible that he could be mistaken.
After a preposition
We had a discussion about who should be invited.
After an adjective
I was ashamed that I'd let my friends down.
After a noun
You can't deny the fact that you received the message.
261 Introduction to noun clauses
1 A noun clause begins with that, a question word or if/whether.
I expected that we would be late.
We didn't know what time it was.
We'll have to decide if/whether we can afford it.
Here the noun clauses are the object of the sentence.