can intervene
Verbo regular: intervene - intervened- intervened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can intervene
you can intervene
he can intervene
we can intervene
you can intervene
they can intervene 	I can be intervening
you can be intervening
he can be intervening
we can be intervening
you can be intervening
they can be intervening	I can have intervened
you can have intervened
he can have intervened
we can have intervened
you can have intervened
they can have intervened	I can have been intervening
you can have been intervening
he can have been intervening
we can have been intervening
you can have been intervening
they can have been intervening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot intervene
you cannot intervene
he cannot intervene
we cannot intervene
you cannot intervene
they cannot intervene 	I cannot be intervening
you cannot be intervening
he cannot be intervening
we cannot be intervening
you cannot be intervening
they cannot be intervening	I cannot have intervened
you cannot have intervened
he cannot have intervened
we cannot have intervened
you cannot have intervened
they cannot have intervened	I cannot have been intervening
you cannot have been intervening
he cannot have been intervening
we cannot have been intervening
you cannot have been intervening
they cannot have been intervening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I intervene?
can you intervene?
can he intervene?
can we intervene?
can you intervene?
can they intervene? 	can I be intervening?
can you be intervening?
can he be intervening?
can we be intervening?
can you be intervening?
can they be intervening? 	can I have intervened?
can you have intervened?
can he have intervened?
can we have intervened?
can you have intervened?
can they have intervened? 	can I have been intervening?
can you have been intervening?
can he have been intervening?
can we have been intervening?
can you have been intervening?
can they have been intervening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not intervene?
can you not intervene?
can he not intervene?
can we not intervene?
can you not intervene?
can they not intervene? 	can I not be intervening?
can you not be intervening?
can he not be intervening?
can we not be intervening?
can you not be intervening?
can they not be intervening? 	can I not have intervened?
can you not have intervened?
can he not have intervened?
can we not have intervened?
can you not have intervened?
can they not have intervened? 	can I not have been intervening?
can you not have been intervening?
can he not have been intervening?
can we not have been intervening?
can you not have been intervening?
can they not have been intervening?