could radiograph
Regular verb: radiograph - radiographed- radiographed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could radiograph
you could radiograph
he could radiograph
we could radiograph
you could radiograph
they could radiograph 	I could be radiographing
you could be radiographing
he could be radiographing
we could be radiographing
you could be radiographing
they could be radiographing	I could have radiographed
you could have radiographed
he could have radiographed
we could have radiographed
you could have radiographed
they could have radiographed	I could have been radiographing
you could have been radiographing
he could have been radiographing
we could have been radiographing
you could have been radiographing
they could have been radiographing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't radiograph
you couldn't radiograph
he couldn't radiograph
we couldn't radiograph
you couldn't radiograph
they couldn't radiograph 	I couldn't be radiographing
you couldn't be radiographing
he couldn't be radiographing
we couldn't be radiographing
you couldn't be radiographing
they couldn't be radiographing	I couldn't have radiographed
you couldn't have radiographed
he couldn't have radiographed
we couldn't have radiographed
you couldn't have radiographed
they couldn't have radiographed	I couldn't have been radiographing
you couldn't have been radiographing
he couldn't have been radiographing
we couldn't have been radiographing
you couldn't have been radiographing
they couldn't have been radiographing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I radiograph?
could you radiograph?
could he radiograph?
could we radiograph?
could you radiograph?
could they radiograph? 	could I be radiographing?
could you be radiographing?
could he be radiographing?
could we be radiographing?
could you be radiographing?
could they be radiographing? 	could I have radiographed?
could you have radiographed?
could he have radiographed?
could we have radiographed?
could you have radiographed?
could they have radiographed? 	could I have been radiographing?
could you have been radiographing?
could he have been radiographing?
could we have been radiographing?
could you have been radiographing?
could they have been radiographing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I radiograph?
couldn't you radiograph?
couldn't he radiograph?
couldn't we radiograph?
couldn't you radiograph?
couldn't they radiograph? 	couldn't I be radiographing?
couldn't you be radiographing?
couldn't he be radiographing?
couldn't we be radiographing?
couldn't you be radiographing?
couldn't they be radiographing? 	couldn't I have radiographed?
couldn't you have radiographed?
couldn't he have radiographed?
couldn't we have radiographed?
couldn't you have radiographed?
couldn't they have radiographed? 	couldn't I have been radiographing?
couldn't you have been radiographing?
couldn't he have been radiographing?
couldn't we have been radiographing?
couldn't you have been radiographing?
couldn't they have been radiographing?