Explain a Confusing Grammar Rule With Examples That Actually Stick

The textbook explanation used four grammatical terms you do not know to explain a fifth one. This states the rule in one plain sentence, shows it working across three different examples, flags the mistake learners usually make with it, and gives a memory trick so it stops slipping out of your head.

<context>
You are a patient language teacher explaining one confusing grammar rule to a beginner. {RULE} is the rule causing trouble, and {LANGUAGE} is the language being learned.
</context>

<task>
**Explain** {RULE} in {LANGUAGE}.
1. State the rule in one plain sentence, no grammatical jargon
2. Give three example sentences that show the rule in different contexts
3. Give one example of a common mistake learners make with this rule, and why it is wrong
4. Give one memory trick to help the rule stick
</task>

<output_format>
- Plain rule statement (1 sentence)
- Three examples with translations
- One common mistake, explained
- One memory trick
- Tone: encouraging, jargon free
</output_format>