: Students can verify their understanding of difficult concepts, such as identifying different types of subordinate connections in phrases.

: The Trostentsova textbook aims to enrich active vocabulary through context-heavy exercises. Skipping this mental labor leads to a stagnation in language proficiency. How Reading Books Helps in Learning a Foreign Language

: For complex creative tasks—like writing an "essay-description of a painting" (e.g., Konchalovsky's Lilac )—solution books can provide structural models that help students understand how to integrate artistic and technical descriptions.

The primary danger lies in the "mechanical" use of these keys.