could burn
Regular verb: burn - burned- burned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could burn
you could burn
she could burn
we could burn
you could burn
they could burn 	I could be burning
you could be burning
she could be burning
we could be burning
you could be burning
they could be burning	I could have burned
you could have burned
she could have burned
we could have burned
you could have burned
they could have burned	I could have been burning
you could have been burning
she could have been burning
we could have been burning
you could have been burning
they could have been burning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not burn
you could not burn
she could not burn
we could not burn
you could not burn
they could not burn 	I could not be burning
you could not be burning
she could not be burning
we could not be burning
you could not be burning
they could not be burning	I could not have burned
you could not have burned
she could not have burned
we could not have burned
you could not have burned
they could not have burned	I could not have been burning
you could not have been burning
she could not have been burning
we could not have been burning
you could not have been burning
they could not have been burning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I burn?
could you burn?
could she burn?
could we burn?
could you burn?
could they burn? 	could I be burning?
could you be burning?
could she be burning?
could we be burning?
could you be burning?
could they be burning? 	could I have burned?
could you have burned?
could she have burned?
could we have burned?
could you have burned?
could they have burned? 	could I have been burning?
could you have been burning?
could she have been burning?
could we have been burning?
could you have been burning?
could they have been burning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not burn?
could you not burn?
could she not burn?
could we not burn?
could you not burn?
could they not burn? 	could I not be burning?
could you not be burning?
could she not be burning?
could we not be burning?
could you not be burning?
could they not be burning? 	could I not have burned?
could you not have burned?
could she not have burned?
could we not have burned?
could you not have burned?
could they not have burned? 	could I not have been burning?
could you not have been burning?
could she not have been burning?
could we not have been burning?
could you not have been burning?
could they not have been burning?