can observe
Verbo regular: observe - observed- observed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can observe
you can observe
she can observe
we can observe
you can observe
they can observe 	I can be observing
you can be observing
she can be observing
we can be observing
you can be observing
they can be observing	I can have observed
you can have observed
she can have observed
we can have observed
you can have observed
they can have observed	I can have been observing
you can have been observing
she can have been observing
we can have been observing
you can have been observing
they can have been observing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot observe
you cannot observe
she cannot observe
we cannot observe
you cannot observe
they cannot observe 	I cannot be observing
you cannot be observing
she cannot be observing
we cannot be observing
you cannot be observing
they cannot be observing	I cannot have observed
you cannot have observed
she cannot have observed
we cannot have observed
you cannot have observed
they cannot have observed	I cannot have been observing
you cannot have been observing
she cannot have been observing
we cannot have been observing
you cannot have been observing
they cannot have been observing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I observe?
can you observe?
can she observe?
can we observe?
can you observe?
can they observe? 	can I be observing?
can you be observing?
can she be observing?
can we be observing?
can you be observing?
can they be observing? 	can I have observed?
can you have observed?
can she have observed?
can we have observed?
can you have observed?
can they have observed? 	can I have been observing?
can you have been observing?
can she have been observing?
can we have been observing?
can you have been observing?
can they have been observing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not observe?
can you not observe?
can she not observe?
can we not observe?
can you not observe?
can they not observe? 	can I not be observing?
can you not be observing?
can she not be observing?
can we not be observing?
can you not be observing?
can they not be observing? 	can I not have observed?
can you not have observed?
can she not have observed?
can we not have observed?
can you not have observed?
can they not have observed? 	can I not have been observing?
can you not have been observing?
can she not have been observing?
can we not have been observing?
can you not have been observing?
can they not have been observing?