could triffle
Regular verb: triffle - triffled- triffled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could triffle
you could triffle
he could triffle
we could triffle
you could triffle
they could triffle 	I could be triffling
you could be triffling
he could be triffling
we could be triffling
you could be triffling
they could be triffling	I could have triffled
you could have triffled
he could have triffled
we could have triffled
you could have triffled
they could have triffled	I could have been triffling
you could have been triffling
he could have been triffling
we could have been triffling
you could have been triffling
they could have been triffling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't triffle
you couldn't triffle
he couldn't triffle
we couldn't triffle
you couldn't triffle
they couldn't triffle 	I couldn't be triffling
you couldn't be triffling
he couldn't be triffling
we couldn't be triffling
you couldn't be triffling
they couldn't be triffling	I couldn't have triffled
you couldn't have triffled
he couldn't have triffled
we couldn't have triffled
you couldn't have triffled
they couldn't have triffled	I couldn't have been triffling
you couldn't have been triffling
he couldn't have been triffling
we couldn't have been triffling
you couldn't have been triffling
they couldn't have been triffling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I triffle?
could you triffle?
could he triffle?
could we triffle?
could you triffle?
could they triffle? 	could I be triffling?
could you be triffling?
could he be triffling?
could we be triffling?
could you be triffling?
could they be triffling? 	could I have triffled?
could you have triffled?
could he have triffled?
could we have triffled?
could you have triffled?
could they have triffled? 	could I have been triffling?
could you have been triffling?
could he have been triffling?
could we have been triffling?
could you have been triffling?
could they have been triffling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I triffle?
couldn't you triffle?
couldn't he triffle?
couldn't we triffle?
couldn't you triffle?
couldn't they triffle? 	couldn't I be triffling?
couldn't you be triffling?
couldn't he be triffling?
couldn't we be triffling?
couldn't you be triffling?
couldn't they be triffling? 	couldn't I have triffled?
couldn't you have triffled?
couldn't he have triffled?
couldn't we have triffled?
couldn't you have triffled?
couldn't they have triffled? 	couldn't I have been triffling?
couldn't you have been triffling?
couldn't he have been triffling?
couldn't we have been triffling?
couldn't you have been triffling?
couldn't they have been triffling?