can butter
Regular verb: butter - buttered- buttered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can butter
you can butter
he can butter
we can butter
you can butter
they can butter 	I can be buttering
you can be buttering
he can be buttering
we can be buttering
you can be buttering
they can be buttering	I can have buttered
you can have buttered
he 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
he 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 cannot butter
you cannot butter
he cannot butter
we cannot butter
you cannot butter
they cannot butter 	I cannot be buttering
you cannot be buttering
he cannot be buttering
we cannot be buttering
you cannot be buttering
they cannot be buttering	I cannot have buttered
you cannot have buttered
he cannot have buttered
we cannot have buttered
you cannot have buttered
they cannot have buttered	I cannot have been buttering
you cannot have been buttering
he cannot have been buttering
we cannot have been buttering
you cannot have been buttering
they cannot have been buttering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I butter?
can you butter?
can he butter?
can we butter?
can you butter?
can they butter? 	can I be buttering?
can you be buttering?
can he be buttering?
can we be buttering?
can you be buttering?
can they be buttering? 	can I have buttered?
can you have buttered?
can he 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 he 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 I not butter?
can you not butter?
can he not butter?
can we not butter?
can you not butter?
can they not butter? 	can I not be buttering?
can you not be buttering?
can he not be buttering?
can we not be buttering?
can you not be buttering?
can they not be buttering? 	can I not have buttered?
can you not have buttered?
can he not have buttered?
can we not have buttered?
can you not have buttered?
can they not have buttered? 	can I not have been buttering?
can you not have been buttering?
can he not have been buttering?
can we not have been buttering?
can you not have been buttering?
can they not have been buttering?