Conjugación del verbo inglés
CAN UNDERSIGN

Verbo regular: undersign - undersigned - undersigned

Afirmación

Forma simple	Forma con V-ing
I can undersign you can undersign he can undersign we can undersign you can undersign they can undersign	I can be undersigning you can be undersigning he can be undersigning we can be undersigning you can be undersigning they can be undersigning
Perfecto	Perfecto con V-ing
I can have undersigned you can have undersigned he can have undersigned we can have undersigned you can have undersigned they can have undersigned	I can have been undersigning you can have been undersigning he can have been undersigning we can have been undersigning you can have been undersigning they can have been undersigning

Negación

Forma simple	Forma con V-ing
I cannot undersign you cannot undersign he cannot undersign we cannot undersign you cannot undersign they cannot undersign	I cannot be undersigning you cannot be undersigning he cannot be undersigning we cannot be undersigning you cannot be undersigning they cannot be undersigning
Perfecto	Perfecto con V-ing
I cannot have undersigned you cannot have undersigned he cannot have undersigned we cannot have undersigned you cannot have undersigned they cannot have undersigned	I cannot have been undersigning you cannot have been undersigning he cannot have been undersigning we cannot have been undersigning you cannot have been undersigning they cannot have been undersigning

Forma interrogativa

Forma simple	Forma con V-ing
can I undersign? can you undersign? can he undersign? can we undersign? can you undersign? can they undersign?	can I be undersigning? can you be undersigning? can he be undersigning? can we be undersigning? can you be undersigning? can they be undersigning?
Perfecto	Perfecto con V-ing
can I have undersigned? can you have undersigned? can he have undersigned? can we have undersigned? can you have undersigned? can they have undersigned?	can I have been undersigning? can you have been undersigning? can he have been undersigning? can we have been undersigning? can you have been undersigning? can they have been undersigning?

Forma interro-negativa

Forma simple	Forma con V-ing
can I not undersign? can you not undersign? can he not undersign? can we not undersign? can you not undersign? can they not undersign?	can I not be undersigning? can you not be undersigning? can he not be undersigning? can we not be undersigning? can you not be undersigning? can they not be undersigning?
Perfecto	Perfecto con V-ing
can I not have undersigned? can you not have undersigned? can he not have undersigned? can we not have undersigned? can you not have undersigned? can they not have undersigned?	can I not have been undersigning? can you not have been undersigning? can he not have been undersigning? can we not have been undersigning? can you not have been undersigning? can they not have been undersigning?