Is 'that' a relative pronoun?
It is a fallacy that prolonged war will weaken an occupied enemy."
Body of lies, movie
Yes, it is. The sentence above is an example of a cleft sentence.
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Tara2Is 'that' a relative pronoun?
No. There is no missing element in the clause (no gap item) where "fallacy" would fit.
'that' introduces a content clause. This sentence has "extraposed it". In other words, a dummy it replaces the whole subject (which is the that-clause), and the subject is moved to the end.
You might
It is a fallacy that prolonged war will weaken an occupied enemy.
I agree with CJ.
"That" cannot be a relative pronoun here because the underlined element is not a relative clause but a subordinate content clause. And it's not a cleft construction either.
It's an extraposed construction where "it" is a dummy element serving the syntactic purpose o
In summary, here's the disambiguation of several different constructions using the same basic sentences.
A prolonged war will weaken the enemy.
It is a prolonged war that will weaken the enemy. (it-cleft)
It is the enemy that a prolonged war will weaken. (it-cleft)
That a prolonged war will weaken the enemy is a common belief.
It is a