I can extend you can extend she can extend we can extend you can extend they can extend
Forma con V-ing
I can be extending you can be extending she can be extending we can be extending you can be extending they can be extending
Perfecto
I can have extended you can have extended she can have extended we can have extended you can have extended they can have extended
Perfecto con V-ing
I can have been extending you can have been extending she can have been extending we can have been extending you can have been extending they can have been extending
Negación
Forma simple
I can't extend you can't extend she can't extend we can't extend you can't extend they can't extend
Forma con V-ing
I can't be extending you can't be extending she can't be extending we can't be extending you can't be extending they can't be extending
Perfecto
I can't have extended you can't have extended she can't have extended we can't have extended you can't have extended they can't have extended
Perfecto con V-ing
I can't have been extending you can't have been extending she can't have been extending we can't have been extending you can't have been extending they can't have been extending
Forma interrogativa
Forma simple
can I extend? can you extend? can she extend? can we extend? can you extend? can they extend?
Forma con V-ing
can I be extending? can you be extending? can she be extending? can we be extending? can you be extending? can they be extending?
Perfecto
can I have extended? can you have extended? can she have extended? can we have extended? can you have extended? can they have extended?
Perfecto con V-ing
can I have been extending? can you have been extending? can she have been extending? can we have been extending? can you have been extending? can they have been extending?
Forma interro-negativa
Forma simple
can't I extend? can't you extend? can't she extend? can't we extend? can't you extend? can't they extend?
Forma con V-ing
can't I be extending? can't you be extending? can't she be extending? can't we be extending? can't you be extending? can't they be extending?
Perfecto
can't I have extended? can't you have extended? can't she have extended? can't we have extended? can't you have extended? can't they have extended?
Perfecto con V-ing
can't I have been extending? can't you have been extending? can't she have been extending? can't we have been extending? can't you have been extending? can't they have been extending?