Verbs
Examples
Use "have" or has" for present perfect
They have been to Cartagena.
I have, too.
They haven't been to Cartagena.
I haven't either.
Use "will" or "won't" for simple future
Ivone will return the clothes tomorrow.
I will, too.
Ivone won't return the clothes tomorrow.
I won't either.
For modal verbs, repeat just the modal ("would" "can" "should" and others)
I would enjoy playing an instrument.
I would, too.
I wouldn't enjoy playing an instrument.
I wouldn't either.
She can stand on her hands.
I can, too.
She can't stand on her hands.
I can't either.