Mr Black could be at home,____?反意疑问句的答案

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Mr Black could be at home,____?反意疑问句的答案

isn't he?
情态动词表推测 ,看be,不看could

couldn't he?
回答:如果在家就是yes,he could,不在家就是no,he couldn't

couldn't he?

1 Mr Black could be at home,__couldn't he__? ------强调一种“能力”。

2 如果是表猜测,你的句子是错的。应该是:
Mr Black can't be at home,__is he __?
Mr Black couldn't have been at home yesterday ,__was he __?

is not he?

couldn't he?