I know your schoolbag is black.和I think your hat is on the bed.改为否定句

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I know your schoolbag is black.和I think your hat is on the bed.改为否定句
I know your schoolbag is black.和I think your hat is on the bed.改为否定句

I know your schoolbag is black.和I think your hat is on the bed.改为否定句
I donot know your schoolbag is black

在know和think前加don't