I often go to Mumbai. Mumbai is the commercial capital of India. (which)
I often go to Mumbai, which is the commercial capital of India.
In this combined sentence, the two independent clauses are successfully joined using the relative pronoun which. The original sentences repeat the proper noun Mumbai, so we replace the second occurrence with which to avoid repetition. Since Mumbai is a place and the second clause provides additional, non-defining information about it, which is the correct relative pronoun to use here.
Furthermore, a comma is placed before which because the clause gives extra information that is not essential for identifying the noun. This makes the sentence flow smoothly and concisely.
Explanation
The textbook exercise requires joining two sentences using the relative pronoun 'which'. 'Which' is used for things or places to introduce a relative clause. Since the second sentence gives extra information about Mumbai, a comma is used before 'which' to form a non-defining relative clause.
Solution Steps
Step 1: Identify the common noun in both sentences (Mumbai).
Step 2: Replace the second occurrence of the noun with the suggested relative pronoun 'which'.
Step 3: Join the sentences with a comma before 'which' to form: I often go to Mumbai, which is the commercial capital of India.