English verb conjugation
COULD SWAN

Regular verb: swan - swaned - swaned

Affirmation

Simple form	V-ing form
I could swan you could swan he could swan we could swan you could swan they could swan	I could be swaning you could be swaning he could be swaning we could be swaning you could be swaning they could be swaning
Perfect	V-ing perfect
I could have swaned you could have swaned he could have swaned we could have swaned you could have swaned they could have swaned	I could have been swaning you could have been swaning he could have been swaning we could have been swaning you could have been swaning they could have been swaning

Negation

Simple form	V-ing form
I could not swan you could not swan he could not swan we could not swan you could not swan they could not swan	I could not be swaning you could not be swaning he could not be swaning we could not be swaning you could not be swaning they could not be swaning
Perfect	V-ing perfect
I could not have swaned you could not have swaned he could not have swaned we could not have swaned you could not have swaned they could not have swaned	I could not have been swaning you could not have been swaning he could not have been swaning we could not have been swaning you could not have been swaning they could not have been swaning

Interrogative form

Simple form	V-ing form
could I swan? could you swan? could he swan? could we swan? could you swan? could they swan?	could I be swaning? could you be swaning? could he be swaning? could we be swaning? could you be swaning? could they be swaning?
Perfect	V-ing perfect
could I have swaned? could you have swaned? could he have swaned? could we have swaned? could you have swaned? could they have swaned?	could I have been swaning? could you have been swaning? could he have been swaning? could we have been swaning? could you have been swaning? could they have been swaning?

Interro-negative form

Simple form	V-ing form
could I not swan? could you not swan? could he not swan? could we not swan? could you not swan? could they not swan?	could I not be swaning? could you not be swaning? could he not be swaning? could we not be swaning? could you not be swaning? could they not be swaning?
Perfect	V-ing perfect
could I not have swaned? could you not have swaned? could he not have swaned? could we not have swaned? could you not have swaned? could they not have swaned?	could I not have been swaning? could you not have been swaning? could he not have been swaning? could we not have been swaning? could you not have been swaning? could they not have been swaning?