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P15 · Week 9 · Lesson

P15 · Your Whole Family Is Sanskrit (the r-family) + Second Outfit Learns to Command

Draft · in review
Teacher notes / sources (students may skip)

Corresponds to: Perry Lesson XV (§199–205) = SKT บทที่ 15 (ปัญจมีวิภักติ อาตฺมเนปท + ṛ-stems). Sources: Perry §199–205 (backbone) + Ruppel Ch.24/29 (the kinship-guṇa vs agentive-vṛddhi split and ending pitfalls) + SKT §15.1–15.6 (Thai terminology + namo/Pali comparison) + Goldman §10–11 (pitfall warnings: 2sg always -sva; two groups sharing a nominative form but different stems). Two core items: verbs wearing Ā-clothing learn to give commands (P08's -te meets P14's command voice); the r-family of nouns — the very words behind บิดา/มารดา. The kinship group is front-loaded from Perry Lesson XVI per the schedule calendar (Decoder Cards 29/30 are anchored here). This week's session 4 = Crystallization Lesson Four (collecting P12–15). The 07 draft has no unit like this — this capsule is a newly designed corner piece.

① AnchorA cognate hiding in Thai — recognise it first, then learn its form0. Anchor (5 minutes)
"Today's claim is your own family:
บิดา ← pitā (father — the very word in the 'father' field on official documents).
มารดา ← mātā (mother — the dictionary's archaic form is มาดา; the standard spelling adds an ร).
ธิดา ← dhītā (daughter — a princess is พระราชธิดา). ภาดา ← bhrātā (brother — royal register uses พระภาดา;
the same group also has ภราดร, the very word in ภราดรภาพ, 'brotherhood/fraternity').
Notice what they share? All end in -ดา. What Thai borrowed wasn't the dictionary's stem —
it was the shape Sanskrit takes when this word is the subject of a sentence — your family's terms of address are the fossilized subject hat of Sanskrit."

Lesson sound rule (C3, taught alongside the vocabulary): Sanskrit t, entering Thai, commonly becomes ด: pitā→บิดา, mātā→มา(ร)ดา, dhītā→ธิดา, tārā→ดารา (star). บิดา alone carries two rules at once — p→บ (C1, an old rule from P07) + t→ด (C3, the new rule), just as สุพรรณหงส์ combined E1+E2 in one word — a double-rule word.

② StoryA micro-story you can follow, with only one new form1. Story (CI micro-narrative — A Whole Family of Givers)
๑
🔇
पिता भाषते। कुमार फलम् लभस्व।
pitā bhāṣate. kumāra phalam labhasva.
Father speaks: "Child, take the fruit."
๒
🔇
माता च वदति। वारि लभस्व इति।
mātā ca vadati. vāri labhasva iti.
Mother also says: "Take the water."
๓
🔇
कुमारः पृच्छति। कः दाता इति।
kumāraḥ pṛcchati. kaḥ dātā iti.
The boy asks: "Who is the giver?"
๔
🔇
पिता दाता। माता अपि दात्री।
pitā dātā. mātā api dātrī.
Father is the giver. Mother is a giver too.

(Every verb recycled: bhāṣate←P08, vadati←P01, pṛcchati←P03; labhasva is old friend labhate (P08) wearing this lesson's command-outfit. ca←P03, api←P04, iti←P06 building blocks all recycled. The only new nouns are three: pitā/mātā/dātā, all with Thai anchors. Sandhi: in ๒ labhasva+iti fuses into labhasveti, in ๔ mātā+api fuses into mātāpi — vowel sandhi listen only, don't write; in ๓ kaḥ+dātā→ko (old rule from P02), dātā+iti→dāteti (listen only). Recognition points per sentence: ๑ บิดา/กุมาร/ผล/ลาภ-root; ๒ มารดา/วาริ/ลาภ-root; ๓ กุมาร/ทายก-root; ๔ บิดา/มารดา/ทายก-root + recycled ī-family hat.)

③ Sentence-buildingBuild it sentence by sentence from words you already have2. Sentence-Building (MT track — two threads)

Thread one: the second outfit learns the command voice.

"Last lesson you learned to order people around (laṅkāṃ gaccha!). Verbs wearing Ā-clothing (P08's -te family) swap in a different tail for commands:
'you… go ahead' = -sva: labhate→labhasva (go ahead and take it). bhāṣate→'you go ahead and speak'?" (student: bhāṣasva)
"yudhyate→'you go ahead and fight'?" (student: yudhyasva)
"'let him… go ahead' = -tām: labhatām. 'let us… go ahead together' = -āmahāi: labhāmahāi (let's go ahead and take it together)."
"A free bonus, the politest way of all: the passive rig (P10) can also give commands — kathā kathyatām: 'may the story be told' =
'please, tell us a story.' When asking someone for a favor, Sanskrit flips the direction — it's the most polite way to say it."

▸ Load-reduction point (Goldman): the Ā-clothing command's 'you' is always -sva, no matter the family, no matter the switch — even more uniform than the active side.

Thread two: the r-family — two faces.

"pitā's (father) dictionary identity is pitṛ — ending in that ฤ sound (L00's ★B1 old friend). When it wears the subject hat, it doesn't use -ḥ:
drop the r, lengthen to ā — pitā. Direction hat: pitaram. mātā works the same way: mātā/mātaram.
The doer of an action wears a different face: dātṛ (giver)'s subject hat is likewise dātā, but the direction hat is dātāram — listen carefully:
pitaram is short, dātāram is long. Kinship terms short, agent-nouns long — memorize this pair by ear first."
"The feminine form of an agent-noun wears ī-family clothing: dātā's feminine is dātrī — the whole set of hats follows devī (P11), free of charge."

Building blocks (use-first, analyze-later — this lesson's set): pitre namaḥ / mātre namaḥ (homage to father / homage to mother — a devotional formula).

The นะโม (namo) you chant every day is followed by exactly this kind of form. Pali namo buddhāya = "homage to the Buddha."
The pitre/mātre "to whom" hat gets its formal home later, in the dative case's formal lesson + Crystallization Lesson Four — for now, use the whole phrase as is.

TPRS wrap-up: "Who is speaking? What does father tell the child to do? Who is the giver?" — students issue commands to each other using -sva sentences, choral recitation of ๔.

④ DripGrammar one line at a time; the full table comes at the crystallization lesson3. In-Line Drip (four lines)
Listen4. Listening (audio checklist)
▶ audioAudio checklist for this lesson — placeholders in the preview; the live version uses pre-baked Matcha audio + real recordings (played when logged in, not hot-linked).

Both versions of the four-sentence story; command slices: 🔇labhate↔labhasva🔇↔🔇labhatām↔labhāmahāi🔇 (one word, four moods, read consecutively); bhāṣasva/yudhyasva/kathyatām read slowly; long-short comparison: 🔇pitaram↔dātāram🔇 (kinship short/agent-noun long, five alternating repetitions); labhasveti/ko dāteti/mātāpi sandhi slices (vowel sandhi, listen only); pitre namaḥ/mātre namaḥ (devotional cadence). Teacher may mix in netāram/bhartāram for ear-training only (not tested, see you in Crystallization Lesson Four).

Use5. Use (Exercises)
1
Command-outfit chain: teacher calls out an Ā-clothing verb (labhate/bhāṣate/yudhyate in rotation), student instantly answers the -sva form; advanced round adds -tām/-āmahāi (recast).
2
Long-short listening discrimination: kinship group or agent-noun group? (ten items: mainly pitaram/mātaram/dātāram, mixed with unfamiliar agent-nouns — judge only long vs short.)
3
The politest request (classroom ritual): the whole class says together kathā kathyatām! — teacher genuinely tells a short story as the reward.
4
Decode and reclaim: sweep the whole family in one go — บิดา/มารดา/ธิดา/ภาดา (live proof of C3; incidentally ภราดร←ภราดรภาพ); ทายก←dāyaka (√dā "benefactor" — dātā's Thai relative); นายก←nāyaka (√nī "leader" — นายกรัฐมนตรี, prime minister, is literally "great leader").
5
Introduce your family (mama recycled): mama pitā ___, mama mātā ___; willing students add pitre namaḥ / mātre namaḥ to close.
kośa intakeThis lesson's words enter your personal word-store6. kośa (personal word-store — this lesson's entries)
Words ×3
pitṛ/mātṛ/dātṛ
father पितृ (บิดา ★C1+C3; subject form pitā) / mother मातृ (มารดา, dictionary's archaic form มาดา ★C3) / giver दातृ (ทายก, same root √dā; subject form dātā)
Operations ×2
Command Ā-clothing -sva/-tām/-āmahāi; r-family hats (subject = drop r, lengthen to ā; direction = kinship -aram / agent-noun -āram)
apply to any Ā-clothing verb, command on the spot; pitā/pitaram↔dātā/dātāram side by side
Building block ×1
pitre namaḥ / mātre namaḥ
devotional formula (cf. นะโม/นมัสการ; Pali namo buddhāya); formal home: "to whom" hat in the formal lesson + Crystallization Lesson Four
Sandhi ×1
a/ā+i→e, ā+a→ā (listen only)
paired with labhasveti / ko dāteti / mātāpi audio
Rule ×1
C3 ด←t
linked to บิดา/มารดา/ธิดา/ดารา audio

(Teacher reference words: ธิดา←dhītā (CSV anchor form; its relation to duhitṛ noted as an etymological aside), ภราดร/ภาดา←bhrātṛ, ภรรดร←bhartṛ (husband/supporter), อาจารย์←ācārya, บัณฑิต←paṇḍita, กาล←kāla — Perry/SKT Vocabulary List XV words, reserved for decode-and-reclaim. False-friend warning: Perry List XV word kṛpā (compassion) should NOT be anchored to กรุณา — กรุณา←karuṇā is a different word, unrelated. netṛ/rakṣitṛ/sraṣṭṛ/śāstṛ and other agent-noun groups, svasṛ/naptṛ exceptions (kinship words that nonetheless go the agent-noun route), the aphorism sarpo daśati kālena…, and the Locative Absolute (SKT's note nṛpe rakṣitari) are all material for Crystallization Lesson Four and later lessons, not for this lesson's student page.)

Crystallization linkCrystallization Bridge

This week's session 4 = Crystallization Lesson Four (collecting P12–15): once this lesson passes all four gates, its ṛ-stem section is unlocked — the kinship/agent-noun two-column full table is given a formal home side by side (including four ending pitfalls: nominative singular -ā, ablative singular -ur, long ṝ for accusative/genitive plural, masculine/feminine accusative plural -ṝn/-ṝḥ), + the two-mood full imperative table (P14 active + this lesson's middle, side by side), + the feminine-stem family wrap-up. P16 (optative + go) → Crystallization Lesson Five.