What is the subordinate clause of the following sentence? is it a noun, adjective, or adverb clause?: The cat that is sitting in the window weighs twenty-six pounds.
The subordinate clause is "that is sitting in the window".
It'is a relative clause introduced by the relative pronoun "that".
A subordinate clause is a group of words with a subject and a verb but is not a complete thought that can stand on it's own.
A relative clause relates information about its antecedent (the noun or pronoun that a pronoun is replacing).
The pronoun "that" is taking the place of the noun "cat" and relating information about it. Specifically, the cat "that is sitting in the window".