can obsess
Verbo regular: obsess - obsessed- obsessed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can obsess
you can obsess
he can obsess
we can obsess
you can obsess
they can obsess 	I can be obsessing
you can be obsessing
he can be obsessing
we can be obsessing
you can be obsessing
they can be obsessing	I can have obsessed
you can have obsessed
he can have obsessed
we can have obsessed
you can have obsessed
they can have obsessed	I can have been obsessing
you can have been obsessing
he can have been obsessing
we can have been obsessing
you can have been obsessing
they can have been obsessing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot obsess
you cannot obsess
he cannot obsess
we cannot obsess
you cannot obsess
they cannot obsess 	I cannot be obsessing
you cannot be obsessing
he cannot be obsessing
we cannot be obsessing
you cannot be obsessing
they cannot be obsessing	I cannot have obsessed
you cannot have obsessed
he cannot have obsessed
we cannot have obsessed
you cannot have obsessed
they cannot have obsessed	I cannot have been obsessing
you cannot have been obsessing
he cannot have been obsessing
we cannot have been obsessing
you cannot have been obsessing
they cannot have been obsessing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I obsess?
can you obsess?
can he obsess?
can we obsess?
can you obsess?
can they obsess? 	can I be obsessing?
can you be obsessing?
can he be obsessing?
can we be obsessing?
can you be obsessing?
can they be obsessing? 	can I have obsessed?
can you have obsessed?
can he have obsessed?
can we have obsessed?
can you have obsessed?
can they have obsessed? 	can I have been obsessing?
can you have been obsessing?
can he have been obsessing?
can we have been obsessing?
can you have been obsessing?
can they have been obsessing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not obsess?
can you not obsess?
can he not obsess?
can we not obsess?
can you not obsess?
can they not obsess? 	can I not be obsessing?
can you not be obsessing?
can he not be obsessing?
can we not be obsessing?
can you not be obsessing?
can they not be obsessing? 	can I not have obsessed?
can you not have obsessed?
can he not have obsessed?
can we not have obsessed?
can you not have obsessed?
can they not have obsessed? 	can I not have been obsessing?
can you not have been obsessing?
can he not have been obsessing?
can we not have been obsessing?
can you not have been obsessing?
can they not have been obsessing?