Why didn’t he come to the meeting? He hasn’t answered this question.( Appositive clause )
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We walked on tiptoe. We were afraid that we might wake the patient.( Adverbial clause of purpose )
This vase is so beautiful. I can’t help buying it. ( Adverbial clause of result )
It is necessary for the problem to be solved without delay. ( Subject clause )
She doesn’t like people staring at her. ( Passive voice )