could tense
Regular verb: tense - tensed- tensed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tense
you could tense
he could tense
we could tense
you could tense
they could tense 	I could be tensing
you could be tensing
he could be tensing
we could be tensing
you could be tensing
they could be tensing	I could have tensed
you could have tensed
he could have tensed
we could have tensed
you could have tensed
they could have tensed	I could have been tensing
you could have been tensing
he could have been tensing
we could have been tensing
you could have been tensing
they could have been tensing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tense
you couldn't tense
he couldn't tense
we couldn't tense
you couldn't tense
they couldn't tense 	I couldn't be tensing
you couldn't be tensing
he couldn't be tensing
we couldn't be tensing
you couldn't be tensing
they couldn't be tensing	I couldn't have tensed
you couldn't have tensed
he couldn't have tensed
we couldn't have tensed
you couldn't have tensed
they couldn't have tensed	I couldn't have been tensing
you couldn't have been tensing
he couldn't have been tensing
we couldn't have been tensing
you couldn't have been tensing
they couldn't have been tensing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tense?
could you tense?
could he tense?
could we tense?
could you tense?
could they tense? 	could I be tensing?
could you be tensing?
could he be tensing?
could we be tensing?
could you be tensing?
could they be tensing? 	could I have tensed?
could you have tensed?
could he have tensed?
could we have tensed?
could you have tensed?
could they have tensed? 	could I have been tensing?
could you have been tensing?
could he have been tensing?
could we have been tensing?
could you have been tensing?
could they have been tensing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tense?
couldn't you tense?
couldn't he tense?
couldn't we tense?
couldn't you tense?
couldn't they tense? 	couldn't I be tensing?
couldn't you be tensing?
couldn't he be tensing?
couldn't we be tensing?
couldn't you be tensing?
couldn't they be tensing? 	couldn't I have tensed?
couldn't you have tensed?
couldn't he have tensed?
couldn't we have tensed?
couldn't you have tensed?
couldn't they have tensed? 	couldn't I have been tensing?
couldn't you have been tensing?
couldn't he have been tensing?
couldn't we have been tensing?
couldn't you have been tensing?
couldn't they have been tensing?