English verb conjugation
COULD YIELD

Regular verb: yield - yielded - yielded

Affirmation

Simple form	V-ing form
I could yield you could yield he could yield we could yield you could yield they could yield	I could be yielding you could be yielding he could be yielding we could be yielding you could be yielding they could be yielding
Perfect	V-ing perfect
I could have yielded you could have yielded he could have yielded we could have yielded you could have yielded they could have yielded	I could have been yielding you could have been yielding he could have been yielding we could have been yielding you could have been yielding they could have been yielding

Negation

Simple form	V-ing form
I could not yield you could not yield he could not yield we could not yield you could not yield they could not yield	I could not be yielding you could not be yielding he could not be yielding we could not be yielding you could not be yielding they could not be yielding
Perfect	V-ing perfect
I could not have yielded you could not have yielded he could not have yielded we could not have yielded you could not have yielded they could not have yielded	I could not have been yielding you could not have been yielding he could not have been yielding we could not have been yielding you could not have been yielding they could not have been yielding

Interrogative form

Simple form	V-ing form
could I yield? could you yield? could he yield? could we yield? could you yield? could they yield?	could I be yielding? could you be yielding? could he be yielding? could we be yielding? could you be yielding? could they be yielding?
Perfect	V-ing perfect
could I have yielded? could you have yielded? could he have yielded? could we have yielded? could you have yielded? could they have yielded?	could I have been yielding? could you have been yielding? could he have been yielding? could we have been yielding? could you have been yielding? could they have been yielding?

Interro-negative form

Simple form	V-ing form
could I not yield? could you not yield? could he not yield? could we not yield? could you not yield? could they not yield?	could I not be yielding? could you not be yielding? could he not be yielding? could we not be yielding? could you not be yielding? could they not be yielding?
Perfect	V-ing perfect
could I not have yielded? could you not have yielded? could he not have yielded? could we not have yielded? could you not have yielded? could they not have yielded?	could I not have been yielding? could you not have been yielding? could he not have been yielding? could we not have been yielding? could you not have been yielding? could they not have been yielding?