could burden
Regular verb: burden - burdened- burdened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could burden
you could burden
she could burden
we could burden
you could burden
they could burden 	I could be burdening
you could be burdening
she could be burdening
we could be burdening
you could be burdening
they could be burdening	I could have burdened
you could have burdened
she could have burdened
we could have burdened
you could have burdened
they could have burdened	I could have been burdening
you could have been burdening
she could have been burdening
we could have been burdening
you could have been burdening
they could have been burdening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't burden
you couldn't burden
she couldn't burden
we couldn't burden
you couldn't burden
they couldn't burden 	I couldn't be burdening
you couldn't be burdening
she couldn't be burdening
we couldn't be burdening
you couldn't be burdening
they couldn't be burdening	I couldn't have burdened
you couldn't have burdened
she couldn't have burdened
we couldn't have burdened
you couldn't have burdened
they couldn't have burdened	I couldn't have been burdening
you couldn't have been burdening
she couldn't have been burdening
we couldn't have been burdening
you couldn't have been burdening
they couldn't have been burdening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I burden?
could you burden?
could she burden?
could we burden?
could you burden?
could they burden? 	could I be burdening?
could you be burdening?
could she be burdening?
could we be burdening?
could you be burdening?
could they be burdening? 	could I have burdened?
could you have burdened?
could she have burdened?
could we have burdened?
could you have burdened?
could they have burdened? 	could I have been burdening?
could you have been burdening?
could she have been burdening?
could we have been burdening?
could you have been burdening?
could they have been burdening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I burden?
couldn't you burden?
couldn't she burden?
couldn't we burden?
couldn't you burden?
couldn't they burden? 	couldn't I be burdening?
couldn't you be burdening?
couldn't she be burdening?
couldn't we be burdening?
couldn't you be burdening?
couldn't they be burdening? 	couldn't I have burdened?
couldn't you have burdened?
couldn't she have burdened?
couldn't we have burdened?
couldn't you have burdened?
couldn't they have burdened? 	couldn't I have been burdening?
couldn't you have been burdening?
couldn't she have been burdening?
couldn't we have been burdening?
couldn't you have been burdening?
couldn't they have been burdening?