[verb] (+ 了)
[subject] + [verb 1],[verb 2]
When the subject or the object is clear from what was just said, spoken Chinese leaves it out. Nothing replaces it – no pronoun, no "it". A short answer is usually the verb on its own.
A thing just mentioned doesn't come back as 它. Repeating it as 它 is grammatical but sounds stiff.
Once a story has its subject, the following clauses go on without repeating it until a new one comes in.
Requests and suggestions also drop 你 or 我们 when it is obvious who will act.
The short answer repeats the verb from the question. 是 and 对 confirm a statement; they don't answer a question about an action.
In writing, and whenever two people could be meant, the subject stays.