1. Relative clauses are “embedded” grammatical structures, contained inside other grammatical structures. 2. Relative clauses play a central role in English discourse. 3. Relative clause knowledge is ...

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.

BBC Lingohack "英语大破解"：One of UK's most scenic railway lines turns 150 years old 英国最美铁路线之一迎来 150 岁生日 ...

Relative clauses are bound clauses that modify NPs and occasionally CPs. The former are adjoined to NPs. A relative clause contains a WH-phrase which moves and is adjoined to CP: The student who likes ...