In 'The city, which is very crowded, is also very polluted.', 'which is very crowded' is a ............
Q1. In 'The city, which is very crowded, is also very polluted.', 'which is very crowded' is a ............
Answer: Non-restrictive clause
Explanation: 'Which is very crowded' provides additional, non-essential information about 'The city', making it a non-restrictive clause.