must doubt doubt doubt doubt
Verbo regular: doubt doubt doubt doubt - doubt doubt doubt doubted- doubt doubt doubt doubted

, este verbo pode não existir, a conjugação é dada como exemplo.

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must doubt doubt doubt doubt
you must doubt doubt doubt doubt
she must doubt doubt doubt doubt
we must doubt doubt doubt doubt
you must doubt doubt doubt doubt
they must doubt doubt doubt doubt 	I must be doubt doubt doubt doubting
you must be doubt doubt doubt doubting
she must be doubt doubt doubt doubting
we must be doubt doubt doubt doubting
you must be doubt doubt doubt doubting
they must be doubt doubt doubt doubting	I must have doubt doubt doubt doubted
you must have doubt doubt doubt doubted
she must have doubt doubt doubt doubted
we must have doubt doubt doubt doubted
you must have doubt doubt doubt doubted
they must have doubt doubt doubt doubted	I must have been doubt doubt doubt doubting
you must have been doubt doubt doubt doubting
she must have been doubt doubt doubt doubting
we must have been doubt doubt doubt doubting
you must have been doubt doubt doubt doubting
they must have been doubt doubt doubt doubting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not doubt doubt doubt doubt
you must not doubt doubt doubt doubt
she must not doubt doubt doubt doubt
we must not doubt doubt doubt doubt
you must not doubt doubt doubt doubt
they must not doubt doubt doubt doubt 	I must not be doubt doubt doubt doubting
you must not be doubt doubt doubt doubting
she must not be doubt doubt doubt doubting
we must not be doubt doubt doubt doubting
you must not be doubt doubt doubt doubting
they must not be doubt doubt doubt doubting	I must not have doubt doubt doubt doubted
you must not have doubt doubt doubt doubted
she must not have doubt doubt doubt doubted
we must not have doubt doubt doubt doubted
you must not have doubt doubt doubt doubted
they must not have doubt doubt doubt doubted	I must not have been doubt doubt doubt doubting
you must not have been doubt doubt doubt doubting
she must not have been doubt doubt doubt doubting
we must not have been doubt doubt doubt doubting
you must not have been doubt doubt doubt doubting
they must not have been doubt doubt doubt doubting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I doubt doubt doubt doubt?
must you doubt doubt doubt doubt?
must she doubt doubt doubt doubt?
must we doubt doubt doubt doubt?
must you doubt doubt doubt doubt?
must they doubt doubt doubt doubt? 	must I be doubt doubt doubt doubting?
must you be doubt doubt doubt doubting?
must she be doubt doubt doubt doubting?
must we be doubt doubt doubt doubting?
must you be doubt doubt doubt doubting?
must they be doubt doubt doubt doubting? 	must I have doubt doubt doubt doubted?
must you have doubt doubt doubt doubted?
must she have doubt doubt doubt doubted?
must we have doubt doubt doubt doubted?
must you have doubt doubt doubt doubted?
must they have doubt doubt doubt doubted? 	must I have been doubt doubt doubt doubting?
must you have been doubt doubt doubt doubting?
must she have been doubt doubt doubt doubting?
must we have been doubt doubt doubt doubting?
must you have been doubt doubt doubt doubting?
must they have been doubt doubt doubt doubting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not doubt doubt doubt doubt?
must you not doubt doubt doubt doubt?
must she not doubt doubt doubt doubt?
must we not doubt doubt doubt doubt?
must you not doubt doubt doubt doubt?
must they not doubt doubt doubt doubt? 	must I not be doubt doubt doubt doubting?
must you not be doubt doubt doubt doubting?
must she not be doubt doubt doubt doubting?
must we not be doubt doubt doubt doubting?
must you not be doubt doubt doubt doubting?
must they not be doubt doubt doubt doubting? 	must I not have doubt doubt doubt doubted?
must you not have doubt doubt doubt doubted?
must she not have doubt doubt doubt doubted?
must we not have doubt doubt doubt doubted?
must you not have doubt doubt doubt doubted?
must they not have doubt doubt doubt doubted? 	must I not have been doubt doubt doubt doubting?
must you not have been doubt doubt doubt doubting?
must she not have been doubt doubt doubt doubting?
must we not have been doubt doubt doubt doubting?
must you not have been doubt doubt doubt doubting?
must they not have been doubt doubt doubt doubting?