can butter
Regular verb: butter - buttered- buttered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can butter
you can butter
she can butter
we can butter
you can butter
they can butter 	I can be buttering
you can be buttering
she can be buttering
we can be buttering
you can be buttering
they can be buttering	I can have buttered
you can have buttered
she can have buttered
we can have buttered
you can have buttered
they can have buttered	I can have been buttering
you can have been buttering
she can have been buttering
we can have been buttering
you can have been buttering
they can have been buttering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't butter
you can't butter
she can't butter
we can't butter
you can't butter
they can't butter 	I can't be buttering
you can't be buttering
she can't be buttering
we can't be buttering
you can't be buttering
they can't be buttering	I can't have buttered
you can't have buttered
she can't have buttered
we can't have buttered
you can't have buttered
they can't have buttered	I can't have been buttering
you can't have been buttering
she can't have been buttering
we can't have been buttering
you can't have been buttering
they can't have been buttering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I butter?
can you butter?
can she butter?
can we butter?
can you butter?
can they butter? 	can I be buttering?
can you be buttering?
can she be buttering?
can we be buttering?
can you be buttering?
can they be buttering? 	can I have buttered?
can you have buttered?
can she have buttered?
can we have buttered?
can you have buttered?
can they have buttered? 	can I have been buttering?
can you have been buttering?
can she have been buttering?
can we have been buttering?
can you have been buttering?
can they have been buttering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I butter?
can't you butter?
can't she butter?
can't we butter?
can't you butter?
can't they butter? 	can't I be buttering?
can't you be buttering?
can't she be buttering?
can't we be buttering?
can't you be buttering?
can't they be buttering? 	can't I have buttered?
can't you have buttered?
can't she have buttered?
can't we have buttered?
can't you have buttered?
can't they have buttered? 	can't I have been buttering?
can't you have been buttering?
can't she have been buttering?
can't we have been buttering?
can't you have been buttering?
can't they have been buttering?