Sentences exercises in Icelandic grammar are vital in fostering understanding and accurate usage in both spoken and written contexts. They are designed to provide students with a comprehensive view of the structure and complexity of sentences and how these elements harmoniously mingle to convey the desired meaning. Icelandic sentences can be simple, with a subject and predicate, complex containing independent and dependent clauses, or compound with at least two independent clauses.

These exercises leverage the richness of the Icelandic language, including verb conjugation, case changes, word order, and the definite and indefinite articles. They assist in teaching the four cases in Icelandic: nominative, accusative, dative, and genitive, which heavily influence the changes in nouns, pronouns, adjectives, and determiners.

They also focus on the strong inflectional characteristic of Icelandic, making the learner aware of changes in tense, mood, voice, person, and number. The word order, usually SVO (Subject-Verb-Object) in Icelandic, is also a point of attention, especially in questions and negative sentences which may slightly vary.

Moreover, these exercises familiarize students with the usage of articles, which in Icelandic can be suffixed to the noun, unlike most other languages. Regular practice of sentence exercises is crucial in achieving proficiency, as it helps students internalize the nuances and integral aspects of Icelandic grammar.