4. ...what purpose in the clause does the “who/that” serve? ... who/that aren’t too serious. ... who/that have a sense of humour. In the relative pronoun clause... Is it a verb? No. Is it an adjective? No. Is it an object? No.
6. THAT was Grammar Focus 1, relative pronouns as subjects. Next, is Grammar Focus 1, relative pronouns as...(watch and learn!)
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8. What purpose in the clause does the “who/that” serve? verb? adjective? subject? object!!
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10. I’d prefer a guy/girl that I have fun with. relative pronoun clause relative pronoun what it refers/relates to what action it’s going to receive (be the object of)