Conjugación del verbo inglés
CAN UNDERSIGN

Verbo regular: undersign - undersigned - undersigned

Afirmación

Forma simple	Forma con V-ing
I can undersign you can undersign she can undersign we can undersign you can undersign they can undersign	I can be undersigning you can be undersigning she 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 she 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 she 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 can't undersign you can't undersign she can't undersign we can't undersign you can't undersign they can't undersign	I can't be undersigning you can't be undersigning she can't be undersigning we can't be undersigning you can't be undersigning they can't be undersigning
Perfecto	Perfecto con V-ing
I can't have undersigned you can't have undersigned she can't have undersigned we can't have undersigned you can't have undersigned they can't have undersigned	I can't have been undersigning you can't have been undersigning she can't have been undersigning we can't have been undersigning you can't have been undersigning they can't have been undersigning

Forma interrogativa

Forma simple	Forma con V-ing
can I undersign? can you undersign? can she undersign? can we undersign? can you undersign? can they undersign?	can I be undersigning? can you be undersigning? can she 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 she 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 she 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't I undersign? can't you undersign? can't she undersign? can't we undersign? can't you undersign? can't they undersign?	can't I be undersigning? can't you be undersigning? can't she be undersigning? can't we be undersigning? can't you be undersigning? can't they be undersigning?
Perfecto	Perfecto con V-ing
can't I have undersigned? can't you have undersigned? can't she have undersigned? can't we have undersigned? can't you have undersigned? can't they have undersigned?	can't I have been undersigning? can't you have been undersigning? can't she have been undersigning? can't we have been undersigning? can't you have been undersigning? can't they have been undersigning?