Fill coverage gaps in chapters 1-11

Audited each chapter file against actual LLPSI Familia Romana content
using parallel reviewers (Claude general-purpose subagents, codex, gemini).
Each chapter gained missing vocabulary, grammar points, common-error
patterns, and exercise types. ~190 lines added across 11 files.

Highlights per chapter:
- c1: geography proper nouns, -us fem. exceptions, num-question answer pattern
- c2: -er paradigm contrast (puer/vir/liber), -que rewrite drill
- c3: interrog. vs. relative quem, neque rewrite
- c4: nullus/UNUS NAUTA, -ius vocative, eius/suus contrast
- c5: relative pron. (nom.), suus agreement, -ae ambiguity
- c6: passus 4th-decl preview, mille/milia, autem postpositive
- c7: cui drill, plenus + gen., quod (because/relative/interrog.) trap
- c8: hic/ille discourse force, UNUS NAUTA class, quantus/quot trap
- c9: stem recovery from gen., ipse emphasis target, sub + abl. for location
- c10: fera vs. ferus, abesse/adesse/ire infinitives, quia/quod synonymy
- c11: full posse paradigm, dat. of reference (mihi dolet), gaudere syntax

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

llpsi-c3.md

@@ -11,7 +11,7 @@ Topic argument supported (e.g. `/llpsi-c3 accusative`, `/llpsi-c3 verbs`, `/llps
 **Adjectives**: *laetus -a -um* (happy); *īrātus -a -um* (angry); *probus -a -um* (good, well-behaved); *improbus -a -um* (naughty).
 
 **Verbs** (3rd sg. present indicative — only form formally introduced):
-- 1st conj. (-at): *cantat, pulsat, plōrat, vocat, interrogat, verberat*
+- 1st conj. (-at): *cantat, pulsat, plōrat, vocat, interrogat, verberat* (verberat = beats, alongside *pulsat*)
 - 2nd conj. (-et): *rīdet, videt, respondet*
 - 4th conj. (-it): *dormit, venit, audit*
 - (Note: 3rd conj. -it forms appear later. Cap. III shows -at/-et/-it as the three patterns; the GRAMMATICA LATINA in c3 lists them as three groups, not four. The fourth conjugation is formally split out in Cap. IV–V.)
@@ -24,6 +24,8 @@ Topic argument supported (e.g. `/llpsi-c3 accusative`, `/llpsi-c3 verbs`, `/llps
 - acc. **quem** (m.) / **quam** (f.) — *puer quem Aemilia verberat*, *puella quam Mārcus pulsat*
 - (Neuter *quod* comes in Cap. IV.)
 
+**Interrogative**: ***quem?*** (acc. m. sg., "whom?") — same form as relative *quem* but used as a question word: *Quem Mārcus pulsat?*
+
 **Particles**: *neque* (= *et nōn*), *iam* (now/already), *cūr?* (why?), *quia* (because), *ō!*, *hīc* (here).
 
 **Grammar terms**: *nōminātīvus, accūsātīvus, verbum*.
@@ -48,6 +50,10 @@ Topic argument supported (e.g. `/llpsi-c3 accusative`, `/llpsi-c3 verbs`, `/llps
 
 5. **Causal clauses with *quia*** ("because"). Word order: *quia* + clause.
 
+6. **Verb-stem trap**: *rīdet* is 2nd conj. (-et). A *\*rīdit* form would be a wrong analogical 3rd-conj. shape. Drill the -et vs. -it boundary explicitly.
+
+7. **Interrogative vs. relative *quem***: same form, different function. *Quem Mārcus pulsat?* (question) vs. *puer quem Mārcus pulsat* (rel. clause modifying *puer*). Disambiguate by sentence shape (presence of antecedent + main clause).
+
 ## Common error patterns
 
 - **Subject in accusative or object in nominative**: most common starter mistake. *Mārcus pulsat Iūlia* — wrong; should be *Mārcus pulsat Iūliam* (Iūlia is the object).
@@ -55,6 +61,9 @@ Topic argument supported (e.g. `/llpsi-c3 accusative`, `/llpsi-c3 verbs`, `/llps
 - **Forgetting adjective agrees in case too**: *Mārcus puer īrātus est* (nom., correct) BUT *Iūlius puerum īrātus verberat* — wrong; should be *īrātum* (acc. m. sg.) to agree with *puerum*.
 - **Relative pronoun case from antecedent (wrong)**: e.g. student says "the boy whom is laughing" → *puer quem rīdet* — wrong, should be *quī* (subject of *rīdet*).
 - **Person in pronoun**: *Aemilia mē interrogat* spoken by Aemilia about herself — wrong perspective; *mē* = me (the speaker is the object).
+- **Interrogative vs. relative *quem* confusion**: same form, different function. *Quem Mārcus pulsat?* is a question; *puer quem Mārcus pulsat* is a relative clause.
+- **Treating *eum/eam* as nominative**: writing *eum rīdet* meaning "he laughs" — wrong; *eum* is acc. ("him"). Subject "he" is *is* (or unstated).
+- **Dropping *-m* on acc. sg.**: especially neuter (students think "neuter = no ending") writing *\*oppidu*; or omitting agreement *-am* on adjectives.
 
 ## Exercise menu
 
@@ -66,6 +75,10 @@ Topic argument supported (e.g. `/llpsi-c3 accusative`, `/llpsi-c3 verbs`, `/llps
 6. **Relative-clause translation**: "the girl whom Mārcus strikes" → *puella quam Mārcus pulsat.*
 7. **Spot the error**: "Quīntus videt Mārcus." → should be *Mārcum* (direct object → acc.).
 8. **Parse**: present a word and ask for case+number (and gender if needed).
+9. **Interrogative vs. relative *quem* discrimination**: translate *Quem Mārcus pulsat?* (whom does M. strike?) vs. *puer quem Mārcus pulsat plōrat* (the boy whom M. strikes is crying).
+10. **Pronoun substitution**: replace named object with *eum/eam* — *Mārcus Iūliam pulsat* → *Mārcus eam pulsat*; *Aemilia Mārcum vocat* → *Aemilia eum vocat*.
+11. **Verb-class sorting**: given a list of 3sg forms (*cantat, rīdet, dormit, pulsat, videt, audit*), sort into -at / -et / -it groups.
+12. **Negation with *neque***: rewrite *nōn cantat et nōn rīdet* → *neque cantat neque rīdet*.
 
 ## Session start