The "for" is not grammatically necessary, but does (conversationally) slightly change the connotation of the sentence. Without the "for", the focus of the sentence is the hypothetical "jerk"; including "for" switches the focus more to the hypothetical situation involving "some jerk". In this context, the "for" should be included to most accurately convey the intended idea.
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Musicgold'for some jerk to...' doesn't look like a noun phrase.No, but from for to the end of the sentence is, in fact, a noun phrase. It's a for ... to ... clause, and all such clauses are noun-like.
Califjim said:
It's important for him to be here on time.
Pardon my ignorance, but it is still not clear to me. I think in the above sentence the 'for' clause acts as an adverb. Even if you remove it, the remaining sentence has the basic three components: noun/pronoun, verb and object. Whereas in my sentence, if you remove the for clause
Musicgold it is still not clear to me.OK. Maybe you just need a little review about "dummy it".