could screech
Regular verb: screech - screeched- screeched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could screech
you could screech
he could screech
we could screech
you could screech
they could screech 	I could be screeching
you could be screeching
he could be screeching
we could be screeching
you could be screeching
they could be screeching	I could have screeched
you could have screeched
he could have screeched
we could have screeched
you could have screeched
they could have screeched	I could have been screeching
you could have been screeching
he could have been screeching
we could have been screeching
you could have been screeching
they could have been screeching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't screech
you couldn't screech
he couldn't screech
we couldn't screech
you couldn't screech
they couldn't screech 	I couldn't be screeching
you couldn't be screeching
he couldn't be screeching
we couldn't be screeching
you couldn't be screeching
they couldn't be screeching	I couldn't have screeched
you couldn't have screeched
he couldn't have screeched
we couldn't have screeched
you couldn't have screeched
they couldn't have screeched	I couldn't have been screeching
you couldn't have been screeching
he couldn't have been screeching
we couldn't have been screeching
you couldn't have been screeching
they couldn't have been screeching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I screech?
could you screech?
could he screech?
could we screech?
could you screech?
could they screech? 	could I be screeching?
could you be screeching?
could he be screeching?
could we be screeching?
could you be screeching?
could they be screeching? 	could I have screeched?
could you have screeched?
could he have screeched?
could we have screeched?
could you have screeched?
could they have screeched? 	could I have been screeching?
could you have been screeching?
could he have been screeching?
could we have been screeching?
could you have been screeching?
could they have been screeching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I screech?
couldn't you screech?
couldn't he screech?
couldn't we screech?
couldn't you screech?
couldn't they screech? 	couldn't I be screeching?
couldn't you be screeching?
couldn't he be screeching?
couldn't we be screeching?
couldn't you be screeching?
couldn't they be screeching? 	couldn't I have screeched?
couldn't you have screeched?
couldn't he have screeched?
couldn't we have screeched?
couldn't you have screeched?
couldn't they have screeched? 	couldn't I have been screeching?
couldn't you have been screeching?
couldn't he have been screeching?
couldn't we have been screeching?
couldn't you have been screeching?
couldn't they have been screeching?