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-c5.md

@@ -6,7 +6,7 @@ Topic argument supported (e.g. `/llpsi-c5 ablative`, `/llpsi-c5 verbs`, `/llpsi-
 
 ## Vocabulary (new in Cap. V)
 
-**Nouns**: *vīlla -ae* f. (country house); *hortus -ī* m. (garden); *rosa -ae* f.; *līlium -ī* n. (lily); *nāsus -ī* m. (nose); *ōstium -ī* n. (door); *fenestra -ae* f. (window); *ātrium -ī* n.; *impluvium -ī* n.; *aqua -ae* f.; *peristȳlum -ī* n.; *cubiculum -ī* n. (bedroom).
+**Nouns**: *vīlla -ae* f. (country house); *hortus -ī* m. (garden); *rosa -ae* f.; *līlium -ī* n. (lily); *nāsus -ī* m. (nose); *ōstium -ī* n. (door); *fenestra -ae* f. (window); *ātrium -ī* n.; *impluvium -ī* n.; *aqua -ae* f.; *peristȳlum -ī* n.; *cubiculum -ī* n. (bedroom); *vir, virī* m. (man, husband); *domina -ae* f. (mistress, pair with *dominus*).
 
 **Adjectives**: *pulcher, pulchra, pulchrum* (beautiful — mixed-stem 1st/2nd decl., genitive *pulchrī, pulchrae, pulchrī*; the *e* drops in oblique cases); *foedus -a -um* (ugly); *sōlus -a -um* (alone — like *ūnus*: gen. *sōlīus*, dat. *sōlī*, but mostly nom/acc seen here).
 
@@ -20,7 +20,9 @@ Topic argument supported (e.g. `/llpsi-c5 ablative`, `/llpsi-c5 verbs`, `/llpsi-
 
 **Prepositions** taking ablative: **in, ex (out of), ab (from), cum (with), sine (without)**.
 
-**Particle**: *etiam* (also, even, = *quoque*).
+**Particle**: *etiam* (also, even, = *quoque*); *neque/nec* (and not, nor).
+
+**Relative pronoun** (nom. only here): *quī* (m.), *quae* (f.), *quod* (n.) — *Iūlius, **quī** in vīllā habitat...*
 
 **Pronouns** (full 3rd-person paradigm, all genders, sg + pl, nom & acc & abl + gen):
 
@@ -62,7 +64,13 @@ Topic argument supported (e.g. `/llpsi-c5 ablative`, `/llpsi-c5 verbs`, `/llpsi-
 
 5. **Pronoun *is/ea/id* full paradigm** (see table above). Drill systematically.
 
-6. **Adjective *pulcher***: 1st/2nd decl. but with stem change. Nom.sg.m. *pulcher* (no -us!), but oblique cases drop the *e*: *pulchrī, pulchrō, pulchrum, pulchrō*; fem. *pulchra, pulchrae*; n. *pulchrum*. Compare *foedus* (regular *-us, -a, -um*).
+6. **Adjective *pulcher***: 1st/2nd decl. but with stem change. Nom.sg.m. *pulcher* (no -us!), but oblique cases drop the *e*: *pulchrī, pulchrō, pulchrum, pulchrō*; fem. *pulchra, pulchrae*; n. *pulchrum*. Compare *foedus* (regular *-us, -a, -um*). Pattern note: *pulcher* parallels *liber, libera, liberum* (e drops in oblique); contrast *miser, misera, miserum* (e stays).
+
+7. **Relative pronoun *quī/quae/quod*** (nom. only at this stage): introduces a clause modifying a preceding noun. *Iūlius, **quī** in vīllā habitat, dominus est.* — m. *quī*, f. *quae*, n. *quod*. Agrees in gender/number with antecedent.
+
+8. **Possessive *suus/sua/suum* agreement**: *suus* agrees in case/number/gender with the **noun it modifies**, NOT the possessor. *Iūlius vīllam **suam** amat* (fem. acc., agrees with *vīllam*, not with *Iūlius*).
+
+9. **Genitive plural -ōrum / -ārum** generalized: pattern from *eōrum/eārum* extends to nouns — *servōrum, vīllārum, oppidōrum* ("of the slaves/villas/towns").
 
 ## Common error patterns
 
@@ -73,6 +81,9 @@ Topic argument supported (e.g. `/llpsi-c5 ablative`, `/llpsi-c5 verbs`, `/llpsi-
 - ***pulcher* declension**: *pulcherus* — wrong; nom.sg.m. is *pulcher* (no -us). But *pulchrus* would also be wrong; the stem retains *e* only in nom.sg.m.
 - **Confusing *eōs* (acc. m. pl.) with *eōrum* (gen. m. pl.)**: student writes *eōrum vocō* meaning "I call them" — should be *eōs vocō* (acc.). Note: *vocō* is 1sg, which the student doesn't formally have yet — stick to 3rd person.
 - **Word order in commands**: imperatives can come anywhere; don't penalize *Mārce et Quīnte, Iūliam vocāte!* vs. *Vocāte Iūliam, Mārce et Quīnte!*
+- ***suus* vs. *eius***: *suus* = "his/her **own**" (refers to subject); *eius* = "of him/her" (someone else). *Iūlius **suam** vīllam amat* (his own) vs. *Iūlius **eius** vīllam amat* (someone else's).
+- **Gen. sg. (1st decl.) *-ae* vs. nom. pl. *-ae***: *fīliae* is ambiguous — "of the daughter" or "the daughters." Disambiguate by verb number / context.
+- **2nd decl. n. pl. *-a* looks like 1st decl. f. nom. sg. *-a***: *verba* (n. pl., "words") vs. *aqua* (f. sg., "water"). Gender-mark the lexeme, don't guess from the ending.
 
 ## Exercise menu
 
@@ -86,6 +97,10 @@ Topic argument supported (e.g. `/llpsi-c5 ablative`, `/llpsi-c5 verbs`, `/llpsi-
 8. **Spot the error**: "Iūlia ex hortō venit cum quīnque rosae." → *cum quīnque rosīs* (cum takes ablative; rosae is nom/gen sg or nom pl).
 9. **Adjective agreement with *pulcher***: "Decline *hortus pulcher* sg in all cases." → *hortus pulcher, hortum pulchrum, hortī pulchrī, hortō pulchrō.*
 10. **Translate**: "The boys are sleeping in their bedrooms" → *Puerī in cubiculīs (suīs) dormiunt.*
+11. **PENSVM B synonym/antonym**: "Antonym of *pulcher*?" → *foedus.* "Synonym of *etiam*?" → *quoque.*
+12. **Relative-clause completion**: "Iūlius, ___ in vīllā habitat, dominus est." → *quī.* "Aemilia, ___ pulchra est, in hortō ambulat." → *quae.*
+13. **Possessive substitution**: "Iūlius vīllam *Iūliī* amat" → replace with *suam* (= his own) or *eius* (= someone else's) and explain the difference.
+14. **Reading-comprehension Q in Latin**: "*Ubi est impluvium?*" → *In ātriō.* "*Quis in cubiculō dormit?*" → student answers in Latin.
 
 ## Session start