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 can't swan you can't swan he can't swan we can't swan you can't swan they can't swan	I can't be swaning you can't be swaning he can't be swaning we can't be swaning you can't be swaning they can't be swaning
Perfect	V-ing perfect
I can't have swaned you can't have swaned he can't have swaned we can't have swaned you can't have swaned they can't have swaned	I can't have been swaning you can't have been swaning he can't have been swaning we can't have been swaning you can't have been swaning they can't 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't I swan? can't you swan? can't he swan? can't we swan? can't you swan? can't they swan?	can't I be swaning? can't you be swaning? can't he be swaning? can't we be swaning? can't you be swaning? can't they be swaning?
Perfect	V-ing perfect
can't I have swaned? can't you have swaned? can't he have swaned? can't we have swaned? can't you have swaned? can't they have swaned?	can't I have been swaning? can't you have been swaning? can't he have been swaning? can't we have been swaning? can't you have been swaning? can't they have been swaning?