English verb conjugation
CAN SWAN

Regular verb: swan - swaned - swaned

Affirmation

Simple form	V-ing form
I can swan you can swan he can swan we can swan you can swan they can swan	I can be swaning you can be swaning he 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 he 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 he 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 he cannot swan we cannot swan you cannot swan they cannot swan	I cannot be swaning you cannot be swaning he 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 he 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 he 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 he swan? can we swan? can you swan? can they swan?	can I be swaning? can you be swaning? can he 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 he 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 he 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 he 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 he 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 he 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 he not have been swaning? can we not have been swaning? can you not have been swaning? can they not have been swaning?