Present (modal + be): Do you think it could be in the basement?, It might be, but the basement is really small., The treasure might not even be there., Maybe it’s in the attic, It could be hidden up there., The treasure can’t be there, But this gold necklace must be valuable, Past (modal + have + V3/ed): it must have belonged to someone important, it must have belonged to rich people., These rooms couldn’t have been used by just anyone. , The people who lived here must have been very rich.,

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