Cambridge publishes a separate Grammar Gear Teacher’s Resource Book for each class. This includes:

Class 4 topics include: nouns (types), pronouns, verbs (present/past tenses), adjectives, adverbs, conjunctions, prepositions, subject-verb agreement, sentence types, and paragraph writing.

While a single full-book PDF may not be freely available, the following resources provide keys for specific Class 4 grammar topics:

When an answer is incorrect, study the solution to understand the grammar rule behind it.

: Updated editions of the book and related study materials can be found at retailers like SchoolChamp .