English verb conjugation
CAN SWAN

Regular verb: swan - swaned - swaned

Affirmation

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

Negation

Simple form	V-ing form
I cannot swan you cannot swan she cannot swan we cannot swan you cannot swan they cannot swan	I cannot be swaning you cannot be swaning she cannot be swaning we cannot be swaning you cannot be swaning they cannot be swaning
Perfect	V-ing perfect
I cannot have swaned you cannot have swaned she cannot have swaned we cannot have swaned you cannot have swaned they cannot have swaned	I cannot have been swaning you cannot have been swaning she cannot have been swaning we cannot have been swaning you cannot have been swaning they cannot have been swaning

Interrogative form

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

Interro-negative form

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