Summarise a Grammar Chapter into a Cheat Sheet

You've read the chapter and now you want the version you'll actually keep open while you write. Paste the text and this condenses it to one page: the core rule in a sentence, a quick-reference table if forms are involved, a handful of essential examples, the irregular cases, and a watch-out box for the easy traps.

I have just read a grammar chapter or textbook section on {GRAMMAR_TOPIC} in {TARGET_LANGUAGE}. Here is the content:

{CHAPTER_TEXT}

Condense this into a one-page cheat sheet. Include: the core rule stated in one sentence; a quick-reference table if the topic involves paradigms or forms; three to five essential example sentences; any exceptions or irregular cases; and a "watch out" box listing the two or three most common mistakes related to this topic. Use bullet points and bold key terms. The cheat sheet should be self-contained. I should be able to understand it without re-reading the chapter.