can frown
Verbo regular: frown - frowned- frowned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can frown
you can frown
he can frown
we can frown
you can frown
they can frown 	I can be frowning
you can be frowning
he can be frowning
we can be frowning
you can be frowning
they can be frowning	I can have frowned
you can have frowned
he can have frowned
we can have frowned
you can have frowned
they can have frowned	I can have been frowning
you can have been frowning
he can have been frowning
we can have been frowning
you can have been frowning
they can have been frowning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can't frown
you can't frown
he can't frown
we can't frown
you can't frown
they can't frown 	I can't be frowning
you can't be frowning
he can't be frowning
we can't be frowning
you can't be frowning
they can't be frowning	I can't have frowned
you can't have frowned
he can't have frowned
we can't have frowned
you can't have frowned
they can't have frowned	I can't have been frowning
you can't have been frowning
he can't have been frowning
we can't have been frowning
you can't have been frowning
they can't have been frowning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I frown?
can you frown?
can he frown?
can we frown?
can you frown?
can they frown? 	can I be frowning?
can you be frowning?
can he be frowning?
can we be frowning?
can you be frowning?
can they be frowning? 	can I have frowned?
can you have frowned?
can he have frowned?
can we have frowned?
can you have frowned?
can they have frowned? 	can I have been frowning?
can you have been frowning?
can he have been frowning?
can we have been frowning?
can you have been frowning?
can they have been frowning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can't I frown?
can't you frown?
can't he frown?
can't we frown?
can't you frown?
can't they frown? 	can't I be frowning?
can't you be frowning?
can't he be frowning?
can't we be frowning?
can't you be frowning?
can't they be frowning? 	can't I have frowned?
can't you have frowned?
can't he have frowned?
can't we have frowned?
can't you have frowned?
can't they have frowned? 	can't I have been frowning?
can't you have been frowning?
can't he have been frowning?
can't we have been frowning?
can't you have been frowning?
can't they have been frowning?