What part-of-speech goes right before the adjective clause?

With relative pronouns - An adjective clause generally begins with a relative pronoun (that, which, who, whom, whose) that connects the clause to the noun or pronoun it modifies. The relative pronoun shows the relationship between the clause and the antecedent.

All adjective clauses are dependent clauses. A dependent clause is a group of words that consists of a subject and a verb, yet it is not a complete sentence that can stand alone. Adjective clauses begin with a relative pronoun, which connects them to the word they describe, such as:

that

where

when

who

whom

whose

which

why

Once you remember the relative pronouns, it's very easy to pick out an adjective clause in a sentence:

Chocolate, which many people adore, is fattening.

People who are smart follow the rules.

I can remember the time when cell phones didn't exist.

Charlie has a friend whose daughter lives in China.

The wine that vintners produce in Tuscany is not cheap.

The reason why Sandra went to law school is that she didn't want to be a doctor.

Notice that each of the italicized adjective clauses begins with a relative pronoun from the list above. This connects it to the noun being described, which comes directly before the relative pronoun in the sentence.

Each adjective clause above also contains a subject and a verb, all of which work together to describe the original noun being modified. For example, the clause which many people adore contains the subject "people" and the verb "adore," yet by itself it is not a complete sentence. Instead, its job is to provide more information to describe the noun "chocolate."

In some cases, the relative pronoun also serves as the subject of the clause. For example, in the adjective clause who is smart, the relative pronoun "who" also acts as the subject that is smart.

Explanation:

have a good day

c, his tragic flaw to cause his downfall

it is believed to be alfred, lord himself