In this sentence, what is the simple predicate?
A loud crash could be heard.
In my opinion, 'could be heard' is the simple predicate of your sentence, because the three parts of the predicate come together to express the sense (hearing) received by the subject (a loud crash).
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In my opinion, 'could be heard' is the simple predicate of your sentence, because the three parts of the predicate come together to express the sense (hearing) received by the subject (a loud crash).