Here is a book of Sarf (grammar / morphology) for beginners, with a clear and accessible and very simple explanation.
The Matn basis for this Sharh is the famous Matn al-Binaae fi 'Ilm asSarf which is a classic.
Within it is a poem of 90 verses and the matn of Sarf are 100% harakat, but not the explanation. Pges 137