could blink
Regular verb: blink - blinked- blinked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blink
you could blink
she could blink
we could blink
you could blink
they could blink 	I could be blinking
you could be blinking
she could be blinking
we could be blinking
you could be blinking
they could be blinking	I could have blinked
you could have blinked
she could have blinked
we could have blinked
you could have blinked
they could have blinked	I could have been blinking
you could have been blinking
she could have been blinking
we could have been blinking
you could have been blinking
they could have been blinking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't blink
you couldn't blink
she couldn't blink
we couldn't blink
you couldn't blink
they couldn't blink 	I couldn't be blinking
you couldn't be blinking
she couldn't be blinking
we couldn't be blinking
you couldn't be blinking
they couldn't be blinking	I couldn't have blinked
you couldn't have blinked
she couldn't have blinked
we couldn't have blinked
you couldn't have blinked
they couldn't have blinked	I couldn't have been blinking
you couldn't have been blinking
she couldn't have been blinking
we couldn't have been blinking
you couldn't have been blinking
they couldn't have been blinking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blink?
could you blink?
could she blink?
could we blink?
could you blink?
could they blink? 	could I be blinking?
could you be blinking?
could she be blinking?
could we be blinking?
could you be blinking?
could they be blinking? 	could I have blinked?
could you have blinked?
could she have blinked?
could we have blinked?
could you have blinked?
could they have blinked? 	could I have been blinking?
could you have been blinking?
could she have been blinking?
could we have been blinking?
could you have been blinking?
could they have been blinking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I blink?
couldn't you blink?
couldn't she blink?
couldn't we blink?
couldn't you blink?
couldn't they blink? 	couldn't I be blinking?
couldn't you be blinking?
couldn't she be blinking?
couldn't we be blinking?
couldn't you be blinking?
couldn't they be blinking? 	couldn't I have blinked?
couldn't you have blinked?
couldn't she have blinked?
couldn't we have blinked?
couldn't you have blinked?
couldn't they have blinked? 	couldn't I have been blinking?
couldn't you have been blinking?
couldn't she have been blinking?
couldn't we have been blinking?
couldn't you have been blinking?
couldn't they have been blinking?