can birch
Verbo regular: birch - birched- birched

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can birch
you can birch
he can birch
we can birch
you can birch
they can birch 	I can be birching
you can be birching
he can be birching
we can be birching
you can be birching
they can be birching	I can have birched
you can have birched
he can have birched
we can have birched
you can have birched
they can have birched	I can have been birching
you can have been birching
he can have been birching
we can have been birching
you can have been birching
they can have been birching	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot birch
you cannot birch
he cannot birch
we cannot birch
you cannot birch
they cannot birch 	I cannot be birching
you cannot be birching
he cannot be birching
we cannot be birching
you cannot be birching
they cannot be birching	I cannot have birched
you cannot have birched
he cannot have birched
we cannot have birched
you cannot have birched
they cannot have birched	I cannot have been birching
you cannot have been birching
he cannot have been birching
we cannot have been birching
you cannot have been birching
they cannot have been birching	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I birch?
can you birch?
can he birch?
can we birch?
can you birch?
can they birch? 	can I be birching?
can you be birching?
can he be birching?
can we be birching?
can you be birching?
can they be birching? 	can I have birched?
can you have birched?
can he have birched?
can we have birched?
can you have birched?
can they have birched? 	can I have been birching?
can you have been birching?
can he have been birching?
can we have been birching?
can you have been birching?
can they have been birching? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not birch?
can you not birch?
can he not birch?
can we not birch?
can you not birch?
can they not birch? 	can I not be birching?
can you not be birching?
can he not be birching?
can we not be birching?
can you not be birching?
can they not be birching? 	can I not have birched?
can you not have birched?
can he not have birched?
can we not have birched?
can you not have birched?
can they not have birched? 	can I not have been birching?
can you not have been birching?
can he not have been birching?
can we not have been birching?
can you not have been birching?
can they not have been birching?