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 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
Perfect	V-ing perfect
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
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
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?
Perfect	V-ing perfect
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?