Sentence theory is a central aspect of Catalan grammar. In Catalan, sentences are typically composed of a subject and a predicate. The subject is the element that performs the action or experiences the state described by the predicate. The predicate, on the other hand, provides information about the subject, such as the action it performs or the state it is in.

Catalan sentences follow a strict word order pattern. Generally, the subject precedes the predicate, although there are exceptions for emphasis or stylistic reasons. The predicate, in turn, typically consists of a verb and can be further expanded with complements or modifiers.

In addition to word order, Catalan also employs verb conjugation to indicate tense, mood, and aspect. This allows for a more precise expression of actions or events. Furthermore, Catalan sentences can be affirmative, negative, interrogative, or imperative, depending on their intended meaning or function.

Overall, understanding sentence theory in Catalan grammar is essential for effectively communicating in the language and constructing accurate and meaningful sentences.