Question

how can we identify an object in a sentence by asking which relative pronoun​

Answer 1

Answer:

You can, however, distinguish them as follows: If the relative pronoun is followed by a verb, the relative pronoun is a subject pronoun. Subject pronouns must always be used. If the relative pronoun is not followed by a verb (but by a noun or pronoun), the relative pronoun is an object pronoun.

Answer 2

Answer:

If the relative pronoun is followed by a verb, the relative pronoun is a subject pronoun. Subject pronouns must always be used. If the relative pronoun is not followed by a verb (but by a noun or pronoun), the relative pronoun is an object pronoun.