English verb conjugation
COULD SINGULARIZE

Regular verb: singularize - singularized - singularized

Affirmation

Simple form	V-ing form
I could singularize you could singularize he could singularize we could singularize you could singularize they could singularize	I could be singularizing you could be singularizing he could be singularizing we could be singularizing you could be singularizing they could be singularizing
Perfect	V-ing perfect
I could have singularized you could have singularized he could have singularized we could have singularized you could have singularized they could have singularized	I could have been singularizing you could have been singularizing he could have been singularizing we could have been singularizing you could have been singularizing they could have been singularizing

Negation

Simple form	V-ing form
I couldn't singularize you couldn't singularize he couldn't singularize we couldn't singularize you couldn't singularize they couldn't singularize	I couldn't be singularizing you couldn't be singularizing he couldn't be singularizing we couldn't be singularizing you couldn't be singularizing they couldn't be singularizing
Perfect	V-ing perfect
I couldn't have singularized you couldn't have singularized he couldn't have singularized we couldn't have singularized you couldn't have singularized they couldn't have singularized	I couldn't have been singularizing you couldn't have been singularizing he couldn't have been singularizing we couldn't have been singularizing you couldn't have been singularizing they couldn't have been singularizing

Interrogative form

Simple form	V-ing form
could I singularize? could you singularize? could he singularize? could we singularize? could you singularize? could they singularize?	could I be singularizing? could you be singularizing? could he be singularizing? could we be singularizing? could you be singularizing? could they be singularizing?
Perfect	V-ing perfect
could I have singularized? could you have singularized? could he have singularized? could we have singularized? could you have singularized? could they have singularized?	could I have been singularizing? could you have been singularizing? could he have been singularizing? could we have been singularizing? could you have been singularizing? could they have been singularizing?

Interro-negative form

Simple form	V-ing form
couldn't I singularize? couldn't you singularize? couldn't he singularize? couldn't we singularize? couldn't you singularize? couldn't they singularize?	couldn't I be singularizing? couldn't you be singularizing? couldn't he be singularizing? couldn't we be singularizing? couldn't you be singularizing? couldn't they be singularizing?
Perfect	V-ing perfect
couldn't I have singularized? couldn't you have singularized? couldn't he have singularized? couldn't we have singularized? couldn't you have singularized? couldn't they have singularized?	couldn't I have been singularizing? couldn't you have been singularizing? couldn't he have been singularizing? couldn't we have been singularizing? couldn't you have been singularizing? couldn't they have been singularizing?