must interfere
Verbo regular: interfere - interfered- interfered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must interfere
you must interfere
she must interfere
we must interfere
you must interfere
they must interfere 	I must be interfering
you must be interfering
she must be interfering
we must be interfering
you must be interfering
they must be interfering	I must have interfered
you must have interfered
she must have interfered
we must have interfered
you must have interfered
they must have interfered	I must have been interfering
you must have been interfering
she must have been interfering
we must have been interfering
you must have been interfering
they must have been interfering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't interfere
you mustn't interfere
she mustn't interfere
we mustn't interfere
you mustn't interfere
they mustn't interfere 	I mustn't be interfering
you mustn't be interfering
she mustn't be interfering
we mustn't be interfering
you mustn't be interfering
they mustn't be interfering	I mustn't have interfered
you mustn't have interfered
she mustn't have interfered
we mustn't have interfered
you mustn't have interfered
they mustn't have interfered	I mustn't have been interfering
you mustn't have been interfering
she mustn't have been interfering
we mustn't have been interfering
you mustn't have been interfering
they mustn't have been interfering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I interfere?
must you interfere?
must she interfere?
must we interfere?
must you interfere?
must they interfere? 	must I be interfering?
must you be interfering?
must she be interfering?
must we be interfering?
must you be interfering?
must they be interfering? 	must I have interfered?
must you have interfered?
must she have interfered?
must we have interfered?
must you have interfered?
must they have interfered? 	must I have been interfering?
must you have been interfering?
must she have been interfering?
must we have been interfering?
must you have been interfering?
must they have been interfering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I interfere?
mustn't you interfere?
mustn't she interfere?
mustn't we interfere?
mustn't you interfere?
mustn't they interfere? 	mustn't I be interfering?
mustn't you be interfering?
mustn't she be interfering?
mustn't we be interfering?
mustn't you be interfering?
mustn't they be interfering? 	mustn't I have interfered?
mustn't you have interfered?
mustn't she have interfered?
mustn't we have interfered?
mustn't you have interfered?
mustn't they have interfered? 	mustn't I have been interfering?
mustn't you have been interfering?
mustn't she have been interfering?
mustn't we have been interfering?
mustn't you have been interfering?
mustn't they have been interfering?