could adhere
Regular verb: adhere - adhered- adhered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could adhere
you could adhere
he could adhere
we could adhere
you could adhere
they could adhere 	I could be adhering
you could be adhering
he could be adhering
we could be adhering
you could be adhering
they could be adhering	I could have adhered
you could have adhered
he could have adhered
we could have adhered
you could have adhered
they could have adhered	I could have been adhering
you could have been adhering
he could have been adhering
we could have been adhering
you could have been adhering
they could have been adhering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't adhere
you couldn't adhere
he couldn't adhere
we couldn't adhere
you couldn't adhere
they couldn't adhere 	I couldn't be adhering
you couldn't be adhering
he couldn't be adhering
we couldn't be adhering
you couldn't be adhering
they couldn't be adhering	I couldn't have adhered
you couldn't have adhered
he couldn't have adhered
we couldn't have adhered
you couldn't have adhered
they couldn't have adhered	I couldn't have been adhering
you couldn't have been adhering
he couldn't have been adhering
we couldn't have been adhering
you couldn't have been adhering
they couldn't have been adhering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I adhere?
could you adhere?
could he adhere?
could we adhere?
could you adhere?
could they adhere? 	could I be adhering?
could you be adhering?
could he be adhering?
could we be adhering?
could you be adhering?
could they be adhering? 	could I have adhered?
could you have adhered?
could he have adhered?
could we have adhered?
could you have adhered?
could they have adhered? 	could I have been adhering?
could you have been adhering?
could he have been adhering?
could we have been adhering?
could you have been adhering?
could they have been adhering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I adhere?
couldn't you adhere?
couldn't he adhere?
couldn't we adhere?
couldn't you adhere?
couldn't they adhere? 	couldn't I be adhering?
couldn't you be adhering?
couldn't he be adhering?
couldn't we be adhering?
couldn't you be adhering?
couldn't they be adhering? 	couldn't I have adhered?
couldn't you have adhered?
couldn't he have adhered?
couldn't we have adhered?
couldn't you have adhered?
couldn't they have adhered? 	couldn't I have been adhering?
couldn't you have been adhering?
couldn't he have been adhering?
couldn't we have been adhering?
couldn't you have been adhering?
couldn't they have been adhering?