English verb conjugation
COULD SUNBURN

Regular verb: sunburn - sunburned - sunburned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not sunburn you could not sunburn he could not sunburn we could not sunburn you could not sunburn they could not sunburn	I could not be sunburning you could not be sunburning he could not be sunburning we could not be sunburning you could not be sunburning they could not be sunburning
Perfect	V-ing perfect
I could not have sunburned you could not have sunburned he could not have sunburned we could not have sunburned you could not have sunburned they could not have sunburned	I could not have been sunburning you could not have been sunburning he could not have been sunburning we could not have been sunburning you could not have been sunburning they could not have been sunburning

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not sunburn? could you not sunburn? could he not sunburn? could we not sunburn? could you not sunburn? could they not sunburn?	could I not be sunburning? could you not be sunburning? could he not be sunburning? could we not be sunburning? could you not be sunburning? could they not be sunburning?
Perfect	V-ing perfect
could I not have sunburned? could you not have sunburned? could he not have sunburned? could we not have sunburned? could you not have sunburned? could they not have sunburned?	could I not have been sunburning? could you not have been sunburning? could he not have been sunburning? could we not have been sunburning? could you not have been sunburning? could they not have been sunburning?