must withstand
Verbo irregular: withstand - withstood- withstood

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must withstand
you must withstand
she must withstand
we must withstand
you must withstand
they must withstand 	I must be withstanding
you must be withstanding
she must be withstanding
we must be withstanding
you must be withstanding
they must be withstanding	I must have withstood
you must have withstood
she must have withstood
we must have withstood
you must have withstood
they must have withstood	I must have been withstanding
you must have been withstanding
she must have been withstanding
we must have been withstanding
you must have been withstanding
they must have been withstanding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not withstand
you must not withstand
she must not withstand
we must not withstand
you must not withstand
they must not withstand 	I must not be withstanding
you must not be withstanding
she must not be withstanding
we must not be withstanding
you must not be withstanding
they must not be withstanding	I must not have withstood
you must not have withstood
she must not have withstood
we must not have withstood
you must not have withstood
they must not have withstood	I must not have been withstanding
you must not have been withstanding
she must not have been withstanding
we must not have been withstanding
you must not have been withstanding
they must not have been withstanding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I withstand?
must you withstand?
must she withstand?
must we withstand?
must you withstand?
must they withstand? 	must I be withstanding?
must you be withstanding?
must she be withstanding?
must we be withstanding?
must you be withstanding?
must they be withstanding? 	must I have withstood?
must you have withstood?
must she have withstood?
must we have withstood?
must you have withstood?
must they have withstood? 	must I have been withstanding?
must you have been withstanding?
must she have been withstanding?
must we have been withstanding?
must you have been withstanding?
must they have been withstanding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not withstand?
must you not withstand?
must she not withstand?
must we not withstand?
must you not withstand?
must they not withstand? 	must I not be withstanding?
must you not be withstanding?
must she not be withstanding?
must we not be withstanding?
must you not be withstanding?
must they not be withstanding? 	must I not have withstood?
must you not have withstood?
must she not have withstood?
must we not have withstood?
must you not have withstood?
must they not have withstood? 	must I not have been withstanding?
must you not have been withstanding?
must she not have been withstanding?
must we not have been withstanding?
must you not have been withstanding?
must they not have been withstanding?