could yuck
Regular verb: yuck - yucked- yucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could yuck
you could yuck
she could yuck
we could yuck
you could yuck
they could yuck 	I could be yucking
you could be yucking
she could be yucking
we could be yucking
you could be yucking
they could be yucking	I could have yucked
you could have yucked
she could have yucked
we could have yucked
you could have yucked
they could have yucked	I could have been yucking
you could have been yucking
she could have been yucking
we could have been yucking
you could have been yucking
they could have been yucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't yuck
you couldn't yuck
she couldn't yuck
we couldn't yuck
you couldn't yuck
they couldn't yuck 	I couldn't be yucking
you couldn't be yucking
she couldn't be yucking
we couldn't be yucking
you couldn't be yucking
they couldn't be yucking	I couldn't have yucked
you couldn't have yucked
she couldn't have yucked
we couldn't have yucked
you couldn't have yucked
they couldn't have yucked	I couldn't have been yucking
you couldn't have been yucking
she couldn't have been yucking
we couldn't have been yucking
you couldn't have been yucking
they couldn't have been yucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I yuck?
could you yuck?
could she yuck?
could we yuck?
could you yuck?
could they yuck? 	could I be yucking?
could you be yucking?
could she be yucking?
could we be yucking?
could you be yucking?
could they be yucking? 	could I have yucked?
could you have yucked?
could she have yucked?
could we have yucked?
could you have yucked?
could they have yucked? 	could I have been yucking?
could you have been yucking?
could she have been yucking?
could we have been yucking?
could you have been yucking?
could they have been yucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I yuck?
couldn't you yuck?
couldn't she yuck?
couldn't we yuck?
couldn't you yuck?
couldn't they yuck? 	couldn't I be yucking?
couldn't you be yucking?
couldn't she be yucking?
couldn't we be yucking?
couldn't you be yucking?
couldn't they be yucking? 	couldn't I have yucked?
couldn't you have yucked?
couldn't she have yucked?
couldn't we have yucked?
couldn't you have yucked?
couldn't they have yucked? 	couldn't I have been yucking?
couldn't you have been yucking?
couldn't she have been yucking?
couldn't we have been yucking?
couldn't you have been yucking?
couldn't they have been yucking?