could clinch
Regular verb: clinch - clinched- clinched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could clinch
you could clinch
she could clinch
we could clinch
you could clinch
they could clinch 	I could be clinching
you could be clinching
she could be clinching
we could be clinching
you could be clinching
they could be clinching	I could have clinched
you could have clinched
she could have clinched
we could have clinched
you could have clinched
they could have clinched	I could have been clinching
you could have been clinching
she could have been clinching
we could have been clinching
you could have been clinching
they could have been clinching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't clinch
you couldn't clinch
she couldn't clinch
we couldn't clinch
you couldn't clinch
they couldn't clinch 	I couldn't be clinching
you couldn't be clinching
she couldn't be clinching
we couldn't be clinching
you couldn't be clinching
they couldn't be clinching	I couldn't have clinched
you couldn't have clinched
she couldn't have clinched
we couldn't have clinched
you couldn't have clinched
they couldn't have clinched	I couldn't have been clinching
you couldn't have been clinching
she couldn't have been clinching
we couldn't have been clinching
you couldn't have been clinching
they couldn't have been clinching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I clinch?
could you clinch?
could she clinch?
could we clinch?
could you clinch?
could they clinch? 	could I be clinching?
could you be clinching?
could she be clinching?
could we be clinching?
could you be clinching?
could they be clinching? 	could I have clinched?
could you have clinched?
could she have clinched?
could we have clinched?
could you have clinched?
could they have clinched? 	could I have been clinching?
could you have been clinching?
could she have been clinching?
could we have been clinching?
could you have been clinching?
could they have been clinching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I clinch?
couldn't you clinch?
couldn't she clinch?
couldn't we clinch?
couldn't you clinch?
couldn't they clinch? 	couldn't I be clinching?
couldn't you be clinching?
couldn't she be clinching?
couldn't we be clinching?
couldn't you be clinching?
couldn't they be clinching? 	couldn't I have clinched?
couldn't you have clinched?
couldn't she have clinched?
couldn't we have clinched?
couldn't you have clinched?
couldn't they have clinched? 	couldn't I have been clinching?
couldn't you have been clinching?
couldn't she have been clinching?
couldn't we have been clinching?
couldn't you have been clinching?
couldn't they have been clinching?