Helen is very ill. She can't work.
`to` Helen is too ill to work.
He is talented. He can play every musical instrument.
`to` Helen isn't well enough to work.
`to` He is too talented to play every musical instrument.
She is young. She can't get dressed.
`to` She is too young to get dressed.
She is young. She can't get dressed herself.
`to` She isn't old enough to get dressed herself.
Cấu trúc: S+ be+ too+ adj/ adv (for Sb)+ to V.