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Is this sentence: "We invited some guests who were late" correct and I'm confident we can't omit the pronoun because it's just wrong. Is it because there's no pronoun/ noun before the verb "were" and is it necessary to have some pronoun or noun in relative clause?

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bee park 687"We invited some guests who were late"

It does not make sense. Here are some good sentences.

We invited some guests, but they all came late.

The guests who we invited on Tuesday were late.
The guests we invited on Tuesday were late.

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bee park 687I'm confident we can't omit the pronoun

Correct. You can't omit the pronoun when it's the subject of its clause. A relative clause must have an explicit subject.

guests [ [who]subj [were late]pred ]rel clause

guests [ [who(m)]d.o. [we]subj [invited]verb ]rel clause


So you can't have 'guests [were late]rel clause',

but you can have 'guests [we invited]rel clause'.

CJ

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