English verb conjugation
COULD LITHOGRAPH

Regular verb: lithograph - lithographed - lithographed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?