must shutter
Verbo regular: shutter - shuttered- shuttered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must shutter
you must shutter
she must shutter
we must shutter
you must shutter
they must shutter 	I must be shuttering
you must be shuttering
she must be shuttering
we must be shuttering
you must be shuttering
they must be shuttering	I must have shuttered
you must have shuttered
she must have shuttered
we must have shuttered
you must have shuttered
they must have shuttered	I must have been shuttering
you must have been shuttering
she must have been shuttering
we must have been shuttering
you must have been shuttering
they must have been shuttering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not shutter
you must not shutter
she must not shutter
we must not shutter
you must not shutter
they must not shutter 	I must not be shuttering
you must not be shuttering
she must not be shuttering
we must not be shuttering
you must not be shuttering
they must not be shuttering	I must not have shuttered
you must not have shuttered
she must not have shuttered
we must not have shuttered
you must not have shuttered
they must not have shuttered	I must not have been shuttering
you must not have been shuttering
she must not have been shuttering
we must not have been shuttering
you must not have been shuttering
they must not have been shuttering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I shutter?
must you shutter?
must she shutter?
must we shutter?
must you shutter?
must they shutter? 	must I be shuttering?
must you be shuttering?
must she be shuttering?
must we be shuttering?
must you be shuttering?
must they be shuttering? 	must I have shuttered?
must you have shuttered?
must she have shuttered?
must we have shuttered?
must you have shuttered?
must they have shuttered? 	must I have been shuttering?
must you have been shuttering?
must she have been shuttering?
must we have been shuttering?
must you have been shuttering?
must they have been shuttering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not shutter?
must you not shutter?
must she not shutter?
must we not shutter?
must you not shutter?
must they not shutter? 	must I not be shuttering?
must you not be shuttering?
must she not be shuttering?
must we not be shuttering?
must you not be shuttering?
must they not be shuttering? 	must I not have shuttered?
must you not have shuttered?
must she not have shuttered?
must we not have shuttered?
must you not have shuttered?
must they not have shuttered? 	must I not have been shuttering?
must you not have been shuttering?
must she not have been shuttering?
must we not have been shuttering?
must you not have been shuttering?
must they not have been shuttering?