could gridlock
Regular verb: gridlock - gridlocked- gridlocked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could gridlock
you could gridlock
he could gridlock
we could gridlock
you could gridlock
they could gridlock 	I could be gridlocking
you could be gridlocking
he could be gridlocking
we could be gridlocking
you could be gridlocking
they could be gridlocking	I could have gridlocked
you could have gridlocked
he could have gridlocked
we could have gridlocked
you could have gridlocked
they could have gridlocked	I could have been gridlocking
you could have been gridlocking
he could have been gridlocking
we could have been gridlocking
you could have been gridlocking
they could have been gridlocking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't gridlock
you couldn't gridlock
he couldn't gridlock
we couldn't gridlock
you couldn't gridlock
they couldn't gridlock 	I couldn't be gridlocking
you couldn't be gridlocking
he couldn't be gridlocking
we couldn't be gridlocking
you couldn't be gridlocking
they couldn't be gridlocking	I couldn't have gridlocked
you couldn't have gridlocked
he couldn't have gridlocked
we couldn't have gridlocked
you couldn't have gridlocked
they couldn't have gridlocked	I couldn't have been gridlocking
you couldn't have been gridlocking
he couldn't have been gridlocking
we couldn't have been gridlocking
you couldn't have been gridlocking
they couldn't have been gridlocking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I gridlock?
could you gridlock?
could he gridlock?
could we gridlock?
could you gridlock?
could they gridlock? 	could I be gridlocking?
could you be gridlocking?
could he be gridlocking?
could we be gridlocking?
could you be gridlocking?
could they be gridlocking? 	could I have gridlocked?
could you have gridlocked?
could he have gridlocked?
could we have gridlocked?
could you have gridlocked?
could they have gridlocked? 	could I have been gridlocking?
could you have been gridlocking?
could he have been gridlocking?
could we have been gridlocking?
could you have been gridlocking?
could they have been gridlocking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I gridlock?
couldn't you gridlock?
couldn't he gridlock?
couldn't we gridlock?
couldn't you gridlock?
couldn't they gridlock? 	couldn't I be gridlocking?
couldn't you be gridlocking?
couldn't he be gridlocking?
couldn't we be gridlocking?
couldn't you be gridlocking?
couldn't they be gridlocking? 	couldn't I have gridlocked?
couldn't you have gridlocked?
couldn't he have gridlocked?
couldn't we have gridlocked?
couldn't you have gridlocked?
couldn't they have gridlocked? 	couldn't I have been gridlocking?
couldn't you have been gridlocking?
couldn't he have been gridlocking?
couldn't we have been gridlocking?
couldn't you have been gridlocking?
couldn't they have been gridlocking?