could swan
Regular verb: swan - swaned- swaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?