Here are the answers to the given question above. 1. RESTRICTIVE; no commas needed. 2. RESTRICTIVE; no commas needed. 3. NONRESTRICTIVE; commas are needed. 4. NONRESTRICTIVE; commas are needed. 5. RESTRICTIVE; no commas needed. When we say restrictive clause, this is the clause in the sentence that serves as an additional description to the given subject, but it is an essential clause and cannot be omitted in the sentence. On the other hand, nonrestrictive clause is the clause opposite to restrictive. This can be omitted and is usually enclosed in commas.
