Object clauses refer to the predicate (verb or adjective) of the principal clause or to the non-finite forms of the verb (the infinitive, the gerund and the participle).
Object clauses are introduced by the conjunctions that, if, whether, lest, by the conjunctive pronouns and adverbs who, whose, what, which, where, when, how, why and asyndetically – the conjunction that is often omitted especially in colloquial speech.
e.g. I know that the posterior pituitary releases antidiuretic hormone and oxytocin.
John asks if glucagon raises the blood sugar level.
The patient wants to know how long he’ll be undergoing HRT.
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