could shadow
Regular verb: shadow - shadowed- shadowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could shadow
you could shadow
he could shadow
we could shadow
you could shadow
they could shadow 	I could be shadowing
you could be shadowing
he could be shadowing
we could be shadowing
you could be shadowing
they could be shadowing	I could have shadowed
you could have shadowed
he could have shadowed
we could have shadowed
you could have shadowed
they could have shadowed	I could have been shadowing
you could have been shadowing
he could have been shadowing
we could have been shadowing
you could have been shadowing
they could have been shadowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not shadow
you could not shadow
he could not shadow
we could not shadow
you could not shadow
they could not shadow 	I could not be shadowing
you could not be shadowing
he could not be shadowing
we could not be shadowing
you could not be shadowing
they could not be shadowing	I could not have shadowed
you could not have shadowed
he could not have shadowed
we could not have shadowed
you could not have shadowed
they could not have shadowed	I could not have been shadowing
you could not have been shadowing
he could not have been shadowing
we could not have been shadowing
you could not have been shadowing
they could not have been shadowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I shadow?
could you shadow?
could he shadow?
could we shadow?
could you shadow?
could they shadow? 	could I be shadowing?
could you be shadowing?
could he be shadowing?
could we be shadowing?
could you be shadowing?
could they be shadowing? 	could I have shadowed?
could you have shadowed?
could he have shadowed?
could we have shadowed?
could you have shadowed?
could they have shadowed? 	could I have been shadowing?
could you have been shadowing?
could he have been shadowing?
could we have been shadowing?
could you have been shadowing?
could they have been shadowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not shadow?
could you not shadow?
could he not shadow?
could we not shadow?
could you not shadow?
could they not shadow? 	could I not be shadowing?
could you not be shadowing?
could he not be shadowing?
could we not be shadowing?
could you not be shadowing?
could they not be shadowing? 	could I not have shadowed?
could you not have shadowed?
could he not have shadowed?
could we not have shadowed?
could you not have shadowed?
could they not have shadowed? 	could I not have been shadowing?
could you not have been shadowing?
could he not have been shadowing?
could we not have been shadowing?
could you not have been shadowing?
could they not have been shadowing?