If you dream of a grammar book, it indicates that you will have many opportunities, and among those opportunities, you will choose the best one. Your friends will help you when you encounter troubles, but they will also bring you more troubles.
Dreaming that you are studying a grammar book implies that you will make the wisest decision among many opportunities.
Dreaming that a grammar book falls to the ground suggests that you will have someone important to help you rise to a higher position.
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