must obsess
Verbo regular: obsess - obsessed- obsessed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must obsess
you must obsess
he must obsess
we must obsess
you must obsess
they must obsess 	I must be obsessing
you must be obsessing
he must be obsessing
we must be obsessing
you must be obsessing
they must be obsessing	I must have obsessed
you must have obsessed
he must have obsessed
we must have obsessed
you must have obsessed
they must have obsessed	I must have been obsessing
you must have been obsessing
he must have been obsessing
we must have been obsessing
you must have been obsessing
they must have been obsessing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not obsess
you must not obsess
he must not obsess
we must not obsess
you must not obsess
they must not obsess 	I must not be obsessing
you must not be obsessing
he must not be obsessing
we must not be obsessing
you must not be obsessing
they must not be obsessing	I must not have obsessed
you must not have obsessed
he must not have obsessed
we must not have obsessed
you must not have obsessed
they must not have obsessed	I must not have been obsessing
you must not have been obsessing
he must not have been obsessing
we must not have been obsessing
you must not have been obsessing
they must not have been obsessing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I obsess?
must you obsess?
must he obsess?
must we obsess?
must you obsess?
must they obsess? 	must I be obsessing?
must you be obsessing?
must he be obsessing?
must we be obsessing?
must you be obsessing?
must they be obsessing? 	must I have obsessed?
must you have obsessed?
must he have obsessed?
must we have obsessed?
must you have obsessed?
must they have obsessed? 	must I have been obsessing?
must you have been obsessing?
must he have been obsessing?
must we have been obsessing?
must you have been obsessing?
must they have been obsessing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not obsess?
must you not obsess?
must he not obsess?
must we not obsess?
must you not obsess?
must they not obsess? 	must I not be obsessing?
must you not be obsessing?
must he not be obsessing?
must we not be obsessing?
must you not be obsessing?
must they not be obsessing? 	must I not have obsessed?
must you not have obsessed?
must he not have obsessed?
must we not have obsessed?
must you not have obsessed?
must they not have obsessed? 	must I not have been obsessing?
must you not have been obsessing?
must he not have been obsessing?
must we not have been obsessing?
must you not have been obsessing?
must they not have been obsessing?