English verb conjugation
COULD YEN

Regular verb: yen - yenned - yenned

Affirmation

Simple form	V-ing form
I could yen you could yen he could yen we could yen you could yen they could yen	I could be yenning you could be yenning he could be yenning we could be yenning you could be yenning they could be yenning
Perfect	V-ing perfect
I could have yenned you could have yenned he could have yenned we could have yenned you could have yenned they could have yenned	I could have been yenning you could have been yenning he could have been yenning we could have been yenning you could have been yenning they could have been yenning

Negation

Simple form	V-ing form
I could not yen you could not yen he could not yen we could not yen you could not yen they could not yen	I could not be yenning you could not be yenning he could not be yenning we could not be yenning you could not be yenning they could not be yenning
Perfect	V-ing perfect
I could not have yenned you could not have yenned he could not have yenned we could not have yenned you could not have yenned they could not have yenned	I could not have been yenning you could not have been yenning he could not have been yenning we could not have been yenning you could not have been yenning they could not have been yenning

Interrogative form

Simple form	V-ing form
could I yen? could you yen? could he yen? could we yen? could you yen? could they yen?	could I be yenning? could you be yenning? could he be yenning? could we be yenning? could you be yenning? could they be yenning?
Perfect	V-ing perfect
could I have yenned? could you have yenned? could he have yenned? could we have yenned? could you have yenned? could they have yenned?	could I have been yenning? could you have been yenning? could he have been yenning? could we have been yenning? could you have been yenning? could they have been yenning?

Interro-negative form

Simple form	V-ing form
could I not yen? could you not yen? could he not yen? could we not yen? could you not yen? could they not yen?	could I not be yenning? could you not be yenning? could he not be yenning? could we not be yenning? could you not be yenning? could they not be yenning?
Perfect	V-ing perfect
could I not have yenned? could you not have yenned? could he not have yenned? could we not have yenned? could you not have yenned? could they not have yenned?	could I not have been yenning? could you not have been yenning? could he not have been yenning? could we not have been yenning? could you not have been yenning? could they not have been yenning?