I was given a set of grammer books that I think are neat. I would compare them to the Sir Cumference books in intent.
They are the World of Language Series by Ruth Heller. I don’t have all of them, but most:
A Cache of Jewels and other collective nouns
Many Luscious Lollipops: A book about Adjectives
Merry-Go-Round: A book about Nouns
Up, Up and Away: A book about Adverbs
Behind the Mask: A Book about Prepositions
Kites Sail High: A book about Verbs
Thought I’d pass these along as ideas to look up your library or to buy to make grammer instruction more interesting perhaps!
Rachel