Using transferred negation:I suppose he doesn’t know the whereab

Using transferred negation:
I suppose he doesn’t know the whereabouts of my silver pen.
【正确答案】：I don't suppose he know the whereabouts of my pen.
【题目解析】：将suppose后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。