could sunburn
Regular verb: sunburn - sunburned- sunburned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sunburn
you could sunburn
he could sunburn
we could sunburn
you could sunburn
they could sunburn 	I could be sunburning
you could be sunburning
he could be sunburning
we could be sunburning
you could be sunburning
they could be sunburning	I could have sunburned
you could have sunburned
he could have sunburned
we could have sunburned
you could have sunburned
they could have sunburned	I could have been sunburning
you could have been sunburning
he could have been sunburning
we could have been sunburning
you could have been sunburning
they could have been sunburning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sunburn
you couldn't sunburn
he couldn't sunburn
we couldn't sunburn
you couldn't sunburn
they couldn't sunburn 	I couldn't be sunburning
you couldn't be sunburning
he couldn't be sunburning
we couldn't be sunburning
you couldn't be sunburning
they couldn't be sunburning	I couldn't have sunburned
you couldn't have sunburned
he couldn't have sunburned
we couldn't have sunburned
you couldn't have sunburned
they couldn't have sunburned	I couldn't have been sunburning
you couldn't have been sunburning
he couldn't have been sunburning
we couldn't have been sunburning
you couldn't have been sunburning
they couldn't have been sunburning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sunburn?
could you sunburn?
could he sunburn?
could we sunburn?
could you sunburn?
could they sunburn? 	could I be sunburning?
could you be sunburning?
could he be sunburning?
could we be sunburning?
could you be sunburning?
could they be sunburning? 	could I have sunburned?
could you have sunburned?
could he have sunburned?
could we have sunburned?
could you have sunburned?
could they have sunburned? 	could I have been sunburning?
could you have been sunburning?
could he have been sunburning?
could we have been sunburning?
could you have been sunburning?
could they have been sunburning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sunburn?
couldn't you sunburn?
couldn't he sunburn?
couldn't we sunburn?
couldn't you sunburn?
couldn't they sunburn? 	couldn't I be sunburning?
couldn't you be sunburning?
couldn't he be sunburning?
couldn't we be sunburning?
couldn't you be sunburning?
couldn't they be sunburning? 	couldn't I have sunburned?
couldn't you have sunburned?
couldn't he have sunburned?
couldn't we have sunburned?
couldn't you have sunburned?
couldn't they have sunburned? 	couldn't I have been sunburning?
couldn't you have been sunburning?
couldn't he have been sunburning?
couldn't we have been sunburning?
couldn't you have been sunburning?
couldn't they have been sunburning?