English verb conjugation
COULD DO DO

Regular verb: do do - do doed - do doed

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could do do you could do do she could do do we could do do you could do do they could do do	I could be do doing you could be do doing she could be do doing we could be do doing you could be do doing they could be do doing
Perfect	V-ing perfect
I could have do doed you could have do doed she could have do doed we could have do doed you could have do doed they could have do doed	I could have been do doing you could have been do doing she could have been do doing we could have been do doing you could have been do doing they could have been do doing

Negation

Simple form	V-ing form
I could not do do you could not do do she could not do do we could not do do you could not do do they could not do do	I could not be do doing you could not be do doing she could not be do doing we could not be do doing you could not be do doing they could not be do doing
Perfect	V-ing perfect
I could not have do doed you could not have do doed she could not have do doed we could not have do doed you could not have do doed they could not have do doed	I could not have been do doing you could not have been do doing she could not have been do doing we could not have been do doing you could not have been do doing they could not have been do doing

Interrogative form

Simple form	V-ing form
could I do do? could you do do? could she do do? could we do do? could you do do? could they do do?	could I be do doing? could you be do doing? could she be do doing? could we be do doing? could you be do doing? could they be do doing?
Perfect	V-ing perfect
could I have do doed? could you have do doed? could she have do doed? could we have do doed? could you have do doed? could they have do doed?	could I have been do doing? could you have been do doing? could she have been do doing? could we have been do doing? could you have been do doing? could they have been do doing?

Interro-negative form

Simple form	V-ing form
could I not do do? could you not do do? could she not do do? could we not do do? could you not do do? could they not do do?	could I not be do doing? could you not be do doing? could she not be do doing? could we not be do doing? could you not be do doing? could they not be do doing?
Perfect	V-ing perfect
could I not have do doed? could you not have do doed? could she not have do doed? could we not have do doed? could you not have do doed? could they not have do doed?	could I not have been do doing? could you not have been do doing? could she not have been do doing? could we not have been do doing? could you not have been do doing? could they not have been do doing?