must butter
Verbo regolare: butter - buttered- buttered

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must butter
you must butter
he must butter
we must butter
you must butter
they must butter 	I must be buttering
you must be buttering
he must be buttering
we must be buttering
you must be buttering
they must be buttering	I must have buttered
you must have buttered
he must have buttered
we must have buttered
you must have buttered
they must have buttered	I must have been buttering
you must have been buttering
he must have been buttering
we must have been buttering
you must have been buttering
they must have been buttering	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not butter
you must not butter
he must not butter
we must not butter
you must not butter
they must not butter 	I must not be buttering
you must not be buttering
he must not be buttering
we must not be buttering
you must not be buttering
they must not be buttering	I must not have buttered
you must not have buttered
he must not have buttered
we must not have buttered
you must not have buttered
they must not have buttered	I must not have been buttering
you must not have been buttering
he must not have been buttering
we must not have been buttering
you must not have been buttering
they must not have been buttering	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I butter?
must you butter?
must he butter?
must we butter?
must you butter?
must they butter? 	must I be buttering?
must you be buttering?
must he be buttering?
must we be buttering?
must you be buttering?
must they be buttering? 	must I have buttered?
must you have buttered?
must he have buttered?
must we have buttered?
must you have buttered?
must they have buttered? 	must I have been buttering?
must you have been buttering?
must he have been buttering?
must we have been buttering?
must you have been buttering?
must they have been buttering? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not butter?
must you not butter?
must he not butter?
must we not butter?
must you not butter?
must they not butter? 	must I not be buttering?
must you not be buttering?
must he not be buttering?
must we not be buttering?
must you not be buttering?
must they not be buttering? 	must I not have buttered?
must you not have buttered?
must he not have buttered?
must we not have buttered?
must you not have buttered?
must they not have buttered? 	must I not have been buttering?
must you not have been buttering?
must he not have been buttering?
must we not have been buttering?
must you not have been buttering?
must they not have been buttering?