could sun
Regular verb: sun - sunned- sunned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sun
you could sun
he could sun
we could sun
you could sun
they could sun 	I could be sunning
you could be sunning
he could be sunning
we could be sunning
you could be sunning
they could be sunning	I could have sunned
you could have sunned
he could have sunned
we could have sunned
you could have sunned
they could have sunned	I could have been sunning
you could have been sunning
he could have been sunning
we could have been sunning
you could have been sunning
they could have been sunning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sun
you could not sun
he could not sun
we could not sun
you could not sun
they could not sun 	I could not be sunning
you could not be sunning
he could not be sunning
we could not be sunning
you could not be sunning
they could not be sunning	I could not have sunned
you could not have sunned
he could not have sunned
we could not have sunned
you could not have sunned
they could not have sunned	I could not have been sunning
you could not have been sunning
he could not have been sunning
we could not have been sunning
you could not have been sunning
they could not have been sunning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sun?
could you sun?
could he sun?
could we sun?
could you sun?
could they sun? 	could I be sunning?
could you be sunning?
could he be sunning?
could we be sunning?
could you be sunning?
could they be sunning? 	could I have sunned?
could you have sunned?
could he have sunned?
could we have sunned?
could you have sunned?
could they have sunned? 	could I have been sunning?
could you have been sunning?
could he have been sunning?
could we have been sunning?
could you have been sunning?
could they have been sunning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sun?
could you not sun?
could he not sun?
could we not sun?
could you not sun?
could they not sun? 	could I not be sunning?
could you not be sunning?
could he not be sunning?
could we not be sunning?
could you not be sunning?
could they not be sunning? 	could I not have sunned?
could you not have sunned?
could he not have sunned?
could we not have sunned?
could you not have sunned?
could they not have sunned? 	could I not have been sunning?
could you not have been sunning?
could he not have been sunning?
could we not have been sunning?
could you not have been sunning?
could they not have been sunning?