Middle Primary level. The Grammar Gremlins series has been designed to reinforce many of the concepts needed to write fluently in the English language - from adjectives and apostrophes to homonyms, speech marks and tenses. Through the variety of creative activities in this series, children are able and motivated to practise the skills they need, either independently or with teacher support. Each main activity allows them to focus on and develop one particular skill. They can then transfer this skill to other work by completing the supplementary activities.