What does sick do before the copula?

Adjective (abbreviation for adjective)

Gross, put it in.

Linking verb

A noun or pronoun before an attribute, such as:

this

ill

old

man

need

quiet

and

have

this

medicine

exist

Time.

Translation:

Sick old people need to rest and take medicine on time.

Note: needs in this sentence is a copulative verb.