An %%adjective clause is a dependent clause that acts like an adjective:%% it provides more information on a noun or pronoun. There are 2 categories: essential and non-essential.
* %%Essential:%% If you took out the clause, the sentence **WILL NOT** make sense.
* “The man __who left his wallet__ is coming back for it.“
* The underlined portion is essential because without it, the word “it“ would have no context, and so the sentence wouldn’t make sense. The clause here is also modifying the noun “man“, so we know it is an adjective clause.
* %%Non-Essential%%: If you took out the clause, the sentence **WILL** make sense.
* “Lisa, __who takes math class with Billy__, is fluent in French.“
* This is a non-essential clause because if we take it out, the sentence still makes sense: no context is lost. The underlined portion is also modifying the noun “Lisa“, so we know it is an adjective clause.