could shrug
Regular verb: shrug - shrugged- shrugged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could shrug
you could shrug
he could shrug
we could shrug
you could shrug
they could shrug 	I could be shrugging
you could be shrugging
he could be shrugging
we could be shrugging
you could be shrugging
they could be shrugging	I could have shrugged
you could have shrugged
he could have shrugged
we could have shrugged
you could have shrugged
they could have shrugged	I could have been shrugging
you could have been shrugging
he could have been shrugging
we could have been shrugging
you could have been shrugging
they could have been shrugging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't shrug
you couldn't shrug
he couldn't shrug
we couldn't shrug
you couldn't shrug
they couldn't shrug 	I couldn't be shrugging
you couldn't be shrugging
he couldn't be shrugging
we couldn't be shrugging
you couldn't be shrugging
they couldn't be shrugging	I couldn't have shrugged
you couldn't have shrugged
he couldn't have shrugged
we couldn't have shrugged
you couldn't have shrugged
they couldn't have shrugged	I couldn't have been shrugging
you couldn't have been shrugging
he couldn't have been shrugging
we couldn't have been shrugging
you couldn't have been shrugging
they couldn't have been shrugging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I shrug?
could you shrug?
could he shrug?
could we shrug?
could you shrug?
could they shrug? 	could I be shrugging?
could you be shrugging?
could he be shrugging?
could we be shrugging?
could you be shrugging?
could they be shrugging? 	could I have shrugged?
could you have shrugged?
could he have shrugged?
could we have shrugged?
could you have shrugged?
could they have shrugged? 	could I have been shrugging?
could you have been shrugging?
could he have been shrugging?
could we have been shrugging?
could you have been shrugging?
could they have been shrugging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I shrug?
couldn't you shrug?
couldn't he shrug?
couldn't we shrug?
couldn't you shrug?
couldn't they shrug? 	couldn't I be shrugging?
couldn't you be shrugging?
couldn't he be shrugging?
couldn't we be shrugging?
couldn't you be shrugging?
couldn't they be shrugging? 	couldn't I have shrugged?
couldn't you have shrugged?
couldn't he have shrugged?
couldn't we have shrugged?
couldn't you have shrugged?
couldn't they have shrugged? 	couldn't I have been shrugging?
couldn't you have been shrugging?
couldn't he have been shrugging?
couldn't we have been shrugging?
couldn't you have been shrugging?
couldn't they have been shrugging?