could suntan
Regular verb: suntan - suntaned- suntaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could suntan
you could suntan
he could suntan
we could suntan
you could suntan
they could suntan 	I could be suntaning
you could be suntaning
he could be suntaning
we could be suntaning
you could be suntaning
they could be suntaning	I could have suntaned
you could have suntaned
he could have suntaned
we could have suntaned
you could have suntaned
they could have suntaned	I could have been suntaning
you could have been suntaning
he could have been suntaning
we could have been suntaning
you could have been suntaning
they could have been suntaning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't suntan
you couldn't suntan
he couldn't suntan
we couldn't suntan
you couldn't suntan
they couldn't suntan 	I couldn't be suntaning
you couldn't be suntaning
he couldn't be suntaning
we couldn't be suntaning
you couldn't be suntaning
they couldn't be suntaning	I couldn't have suntaned
you couldn't have suntaned
he couldn't have suntaned
we couldn't have suntaned
you couldn't have suntaned
they couldn't have suntaned	I couldn't have been suntaning
you couldn't have been suntaning
he couldn't have been suntaning
we couldn't have been suntaning
you couldn't have been suntaning
they couldn't have been suntaning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I suntan?
could you suntan?
could he suntan?
could we suntan?
could you suntan?
could they suntan? 	could I be suntaning?
could you be suntaning?
could he be suntaning?
could we be suntaning?
could you be suntaning?
could they be suntaning? 	could I have suntaned?
could you have suntaned?
could he have suntaned?
could we have suntaned?
could you have suntaned?
could they have suntaned? 	could I have been suntaning?
could you have been suntaning?
could he have been suntaning?
could we have been suntaning?
could you have been suntaning?
could they have been suntaning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I suntan?
couldn't you suntan?
couldn't he suntan?
couldn't we suntan?
couldn't you suntan?
couldn't they suntan? 	couldn't I be suntaning?
couldn't you be suntaning?
couldn't he be suntaning?
couldn't we be suntaning?
couldn't you be suntaning?
couldn't they be suntaning? 	couldn't I have suntaned?
couldn't you have suntaned?
couldn't he have suntaned?
couldn't we have suntaned?
couldn't you have suntaned?
couldn't they have suntaned? 	couldn't I have been suntaning?
couldn't you have been suntaning?
couldn't he have been suntaning?
couldn't we have been suntaning?
couldn't you have been suntaning?
couldn't they have been suntaning?