An essential relative clause provides necessary, defining information about the noun. On the other hand, non‐ essential relative clauses provide additional, non‐necessary information about the noun.

When do I put a comma before but and when do I not have to put a comma before but? What about a comma after but? Songul Kosker and Kazim Cakmak from Turkey write: Hi! Your web site is great. We're ...

For each pair of sentences below, think about ways of combining the two sentences into one new sentence containing a “restrictive relative clause.” Recall that a restrictive relative clause, which is ...