could beep
Regular verb: beep - beeped- beeped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could beep
you could beep
he could beep
we could beep
you could beep
they could beep 	I could be beeping
you could be beeping
he could be beeping
we could be beeping
you could be beeping
they could be beeping	I could have beeped
you could have beeped
he could have beeped
we could have beeped
you could have beeped
they could have beeped	I could have been beeping
you could have been beeping
he could have been beeping
we could have been beeping
you could have been beeping
they could have been beeping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't beep
you couldn't beep
he couldn't beep
we couldn't beep
you couldn't beep
they couldn't beep 	I couldn't be beeping
you couldn't be beeping
he couldn't be beeping
we couldn't be beeping
you couldn't be beeping
they couldn't be beeping	I couldn't have beeped
you couldn't have beeped
he couldn't have beeped
we couldn't have beeped
you couldn't have beeped
they couldn't have beeped	I couldn't have been beeping
you couldn't have been beeping
he couldn't have been beeping
we couldn't have been beeping
you couldn't have been beeping
they couldn't have been beeping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I beep?
could you beep?
could he beep?
could we beep?
could you beep?
could they beep? 	could I be beeping?
could you be beeping?
could he be beeping?
could we be beeping?
could you be beeping?
could they be beeping? 	could I have beeped?
could you have beeped?
could he have beeped?
could we have beeped?
could you have beeped?
could they have beeped? 	could I have been beeping?
could you have been beeping?
could he have been beeping?
could we have been beeping?
could you have been beeping?
could they have been beeping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I beep?
couldn't you beep?
couldn't he beep?
couldn't we beep?
couldn't you beep?
couldn't they beep? 	couldn't I be beeping?
couldn't you be beeping?
couldn't he be beeping?
couldn't we be beeping?
couldn't you be beeping?
couldn't they be beeping? 	couldn't I have beeped?
couldn't you have beeped?
couldn't he have beeped?
couldn't we have beeped?
couldn't you have beeped?
couldn't they have beeped? 	couldn't I have been beeping?
couldn't you have been beeping?
couldn't he have been beeping?
couldn't we have been beeping?
couldn't you have been beeping?
couldn't they have been beeping?