could lithograph
Verbo regular: lithograph - lithographed- lithographed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could lithograph
you could lithograph
he could lithograph
we could lithograph
you could lithograph
they could lithograph 	I could be lithographing
you could be lithographing
he could be lithographing
we could be lithographing
you could be lithographing
they could be lithographing	I could have lithographed
you could have lithographed
he could have lithographed
we could have lithographed
you could have lithographed
they could have lithographed	I could have been lithographing
you could have been lithographing
he could have been lithographing
we could have been lithographing
you could have been lithographing
they could have been lithographing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't lithograph
you couldn't lithograph
he couldn't lithograph
we couldn't lithograph
you couldn't lithograph
they couldn't lithograph 	I couldn't be lithographing
you couldn't be lithographing
he couldn't be lithographing
we couldn't be lithographing
you couldn't be lithographing
they couldn't be lithographing	I couldn't have lithographed
you couldn't have lithographed
he couldn't have lithographed
we couldn't have lithographed
you couldn't have lithographed
they couldn't have lithographed	I couldn't have been lithographing
you couldn't have been lithographing
he couldn't have been lithographing
we couldn't have been lithographing
you couldn't have been lithographing
they couldn't have been lithographing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I lithograph?
could you lithograph?
could he lithograph?
could we lithograph?
could you lithograph?
could they lithograph? 	could I be lithographing?
could you be lithographing?
could he be lithographing?
could we be lithographing?
could you be lithographing?
could they be lithographing? 	could I have lithographed?
could you have lithographed?
could he have lithographed?
could we have lithographed?
could you have lithographed?
could they have lithographed? 	could I have been lithographing?
could you have been lithographing?
could he have been lithographing?
could we have been lithographing?
could you have been lithographing?
could they have been lithographing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I lithograph?
couldn't you lithograph?
couldn't he lithograph?
couldn't we lithograph?
couldn't you lithograph?
couldn't they lithograph? 	couldn't I be lithographing?
couldn't you be lithographing?
couldn't he be lithographing?
couldn't we be lithographing?
couldn't you be lithographing?
couldn't they be lithographing? 	couldn't I have lithographed?
couldn't you have lithographed?
couldn't he have lithographed?
couldn't we have lithographed?
couldn't you have lithographed?
couldn't they have lithographed? 	couldn't I have been lithographing?
couldn't you have been lithographing?
couldn't he have been lithographing?
couldn't we have been lithographing?
couldn't you have been lithographing?
couldn't they have been lithographing?