English verb conjugation
COULD YEARN

Regular verb: yearn - yearned - yearned

Affirmation

Simple form	V-ing form
I could yearn you could yearn he could yearn we could yearn you could yearn they could yearn	I could be yearning you could be yearning he could be yearning we could be yearning you could be yearning they could be yearning
Perfect	V-ing perfect
I could have yearned you could have yearned he could have yearned we could have yearned you could have yearned they could have yearned	I could have been yearning you could have been yearning he could have been yearning we could have been yearning you could have been yearning they could have been yearning

Negation

Simple form	V-ing form
I could not yearn you could not yearn he could not yearn we could not yearn you could not yearn they could not yearn	I could not be yearning you could not be yearning he could not be yearning we could not be yearning you could not be yearning they could not be yearning
Perfect	V-ing perfect
I could not have yearned you could not have yearned he could not have yearned we could not have yearned you could not have yearned they could not have yearned	I could not have been yearning you could not have been yearning he could not have been yearning we could not have been yearning you could not have been yearning they could not have been yearning

Interrogative form

Simple form	V-ing form
could I yearn? could you yearn? could he yearn? could we yearn? could you yearn? could they yearn?	could I be yearning? could you be yearning? could he be yearning? could we be yearning? could you be yearning? could they be yearning?
Perfect	V-ing perfect
could I have yearned? could you have yearned? could he have yearned? could we have yearned? could you have yearned? could they have yearned?	could I have been yearning? could you have been yearning? could he have been yearning? could we have been yearning? could you have been yearning? could they have been yearning?

Interro-negative form

Simple form	V-ing form
could I not yearn? could you not yearn? could he not yearn? could we not yearn? could you not yearn? could they not yearn?	could I not be yearning? could you not be yearning? could he not be yearning? could we not be yearning? could you not be yearning? could they not be yearning?
Perfect	V-ing perfect
could I not have yearned? could you not have yearned? could he not have yearned? could we not have yearned? could you not have yearned? could they not have yearned?	could I not have been yearning? could you not have been yearning? could he not have been yearning? could we not have been yearning? could you not have been yearning? could they not have been yearning?