I can curb you can curb he can curb we can curb you can curb they can curb
Forma con V-ing
I can be curbing you can be curbing he can be curbing we can be curbing you can be curbing they can be curbing
Perfecto
I can have curbed you can have curbed he can have curbed we can have curbed you can have curbed they can have curbed
Perfecto con V-ing
I can have been curbing you can have been curbing he can have been curbing we can have been curbing you can have been curbing they can have been curbing
Negación
Forma simple
I can't curb you can't curb he can't curb we can't curb you can't curb they can't curb
Forma con V-ing
I can't be curbing you can't be curbing he can't be curbing we can't be curbing you can't be curbing they can't be curbing
Perfecto
I can't have curbed you can't have curbed he can't have curbed we can't have curbed you can't have curbed they can't have curbed
Perfecto con V-ing
I can't have been curbing you can't have been curbing he can't have been curbing we can't have been curbing you can't have been curbing they can't have been curbing
Forma interrogativa
Forma simple
can I curb? can you curb? can he curb? can we curb? can you curb? can they curb?
Forma con V-ing
can I be curbing? can you be curbing? can he be curbing? can we be curbing? can you be curbing? can they be curbing?
Perfecto
can I have curbed? can you have curbed? can he have curbed? can we have curbed? can you have curbed? can they have curbed?
Perfecto con V-ing
can I have been curbing? can you have been curbing? can he have been curbing? can we have been curbing? can you have been curbing? can they have been curbing?
Forma interro-negativa
Forma simple
can't I curb? can't you curb? can't he curb? can't we curb? can't you curb? can't they curb?
Forma con V-ing
can't I be curbing? can't you be curbing? can't he be curbing? can't we be curbing? can't you be curbing? can't they be curbing?
Perfecto
can't I have curbed? can't you have curbed? can't he have curbed? can't we have curbed? can't you have curbed? can't they have curbed?
Perfecto con V-ing
can't I have been curbing? can't you have been curbing? can't he have been curbing? can't we have been curbing? can't you have been curbing? can't they have been curbing?