could quad
Regular verb: quad - quaded- quaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could quad
you could quad
she could quad
we could quad
you could quad
they could quad 	I could be quading
you could be quading
she could be quading
we could be quading
you could be quading
they could be quading	I could have quaded
you could have quaded
she could have quaded
we could have quaded
you could have quaded
they could have quaded	I could have been quading
you could have been quading
she could have been quading
we could have been quading
you could have been quading
they could have been quading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't quad
you couldn't quad
she couldn't quad
we couldn't quad
you couldn't quad
they couldn't quad 	I couldn't be quading
you couldn't be quading
she couldn't be quading
we couldn't be quading
you couldn't be quading
they couldn't be quading	I couldn't have quaded
you couldn't have quaded
she couldn't have quaded
we couldn't have quaded
you couldn't have quaded
they couldn't have quaded	I couldn't have been quading
you couldn't have been quading
she couldn't have been quading
we couldn't have been quading
you couldn't have been quading
they couldn't have been quading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I quad?
could you quad?
could she quad?
could we quad?
could you quad?
could they quad? 	could I be quading?
could you be quading?
could she be quading?
could we be quading?
could you be quading?
could they be quading? 	could I have quaded?
could you have quaded?
could she have quaded?
could we have quaded?
could you have quaded?
could they have quaded? 	could I have been quading?
could you have been quading?
could she have been quading?
could we have been quading?
could you have been quading?
could they have been quading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I quad?
couldn't you quad?
couldn't she quad?
couldn't we quad?
couldn't you quad?
couldn't they quad? 	couldn't I be quading?
couldn't you be quading?
couldn't she be quading?
couldn't we be quading?
couldn't you be quading?
couldn't they be quading? 	couldn't I have quaded?
couldn't you have quaded?
couldn't she have quaded?
couldn't we have quaded?
couldn't you have quaded?
couldn't they have quaded? 	couldn't I have been quading?
couldn't you have been quading?
couldn't she have been quading?
couldn't we have been quading?
couldn't you have been quading?
couldn't they have been quading?