could blunder
Regular verb: blunder - blundered- blundered

Affirmation 	
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I could blunder
you could blunder
he could blunder
we could blunder
you could blunder
they could blunder 	I could be blundering
you could be blundering
he could be blundering
we could be blundering
you could be blundering
they could be blundering	I could have blundered
you could have blundered
he could have blundered
we could have blundered
you could have blundered
they could have blundered	I could have been blundering
you could have been blundering
he could have been blundering
we could have been blundering
you could have been blundering
they could have been blundering	

Negation 	
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I couldn't blunder
you couldn't blunder
he couldn't blunder
we couldn't blunder
you couldn't blunder
they couldn't blunder 	I couldn't be blundering
you couldn't be blundering
he couldn't be blundering
we couldn't be blundering
you couldn't be blundering
they couldn't be blundering	I couldn't have blundered
you couldn't have blundered
he couldn't have blundered
we couldn't have blundered
you couldn't have blundered
they couldn't have blundered	I couldn't have been blundering
you couldn't have been blundering
he couldn't have been blundering
we couldn't have been blundering
you couldn't have been blundering
they couldn't have been blundering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blunder?
could you blunder?
could he blunder?
could we blunder?
could you blunder?
could they blunder? 	could I be blundering?
could you be blundering?
could he be blundering?
could we be blundering?
could you be blundering?
could they be blundering? 	could I have blundered?
could you have blundered?
could he have blundered?
could we have blundered?
could you have blundered?
could they have blundered? 	could I have been blundering?
could you have been blundering?
could he have been blundering?
could we have been blundering?
could you have been blundering?
could they have been blundering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I blunder?
couldn't you blunder?
couldn't he blunder?
couldn't we blunder?
couldn't you blunder?
couldn't they blunder? 	couldn't I be blundering?
couldn't you be blundering?
couldn't he be blundering?
couldn't we be blundering?
couldn't you be blundering?
couldn't they be blundering? 	couldn't I have blundered?
couldn't you have blundered?
couldn't he have blundered?
couldn't we have blundered?
couldn't you have blundered?
couldn't they have blundered? 	couldn't I have been blundering?
couldn't you have been blundering?
couldn't he have been blundering?
couldn't we have been blundering?
couldn't you have been blundering?
couldn't they have been blundering?