must shelter
Regular verb: shelter - sheltered- sheltered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must shelter
you must shelter
she must shelter
we must shelter
you must shelter
they must shelter 	I must be sheltering
you must be sheltering
she must be sheltering
we must be sheltering
you must be sheltering
they must be sheltering	I must have sheltered
you must have sheltered
she must have sheltered
we must have sheltered
you must have sheltered
they must have sheltered	I must have been sheltering
you must have been sheltering
she must have been sheltering
we must have been sheltering
you must have been sheltering
they must have been sheltering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not shelter
you must not shelter
she must not shelter
we must not shelter
you must not shelter
they must not shelter 	I must not be sheltering
you must not be sheltering
she must not be sheltering
we must not be sheltering
you must not be sheltering
they must not be sheltering	I must not have sheltered
you must not have sheltered
she must not have sheltered
we must not have sheltered
you must not have sheltered
they must not have sheltered	I must not have been sheltering
you must not have been sheltering
she must not have been sheltering
we must not have been sheltering
you must not have been sheltering
they must not have been sheltering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I shelter?
must you shelter?
must she shelter?
must we shelter?
must you shelter?
must they shelter? 	must I be sheltering?
must you be sheltering?
must she be sheltering?
must we be sheltering?
must you be sheltering?
must they be sheltering? 	must I have sheltered?
must you have sheltered?
must she have sheltered?
must we have sheltered?
must you have sheltered?
must they have sheltered? 	must I have been sheltering?
must you have been sheltering?
must she have been sheltering?
must we have been sheltering?
must you have been sheltering?
must they have been sheltering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not shelter?
must you not shelter?
must she not shelter?
must we not shelter?
must you not shelter?
must they not shelter? 	must I not be sheltering?
must you not be sheltering?
must she not be sheltering?
must we not be sheltering?
must you not be sheltering?
must they not be sheltering? 	must I not have sheltered?
must you not have sheltered?
must she not have sheltered?
must we not have sheltered?
must you not have sheltered?
must they not have sheltered? 	must I not have been sheltering?
must you not have been sheltering?
must she not have been sheltering?
must we not have been sheltering?
must you not have been sheltering?
must they not have been sheltering?