महाभारतः mahābhārataḥ - book-13, chapter-47, verse-3

यथा नरेण कर्तव्यं यश्च धर्मः सनातनः ।
एतत्सर्वं महाबाहो भवान्व्याख्यातुमर्हति ॥३॥

3. yathā nareṇa kartavyaṁ yaśca dharmaḥ sanātanaḥ ,
etatsarvaṁ mahābāho bhavānvyākhyātumarhati.

3. yathā nareṇa kartavyam yaḥ ca dharmaḥ sanātanaḥ
etat sarvam mahābāho bhavān vyākhyātum arhati

3. he mahābāho bhavān etat sarvam yathā nareṇa kartavyam
yaḥ ca sanātanaḥ dharmaḥ ca [asti iti] vyākhyātum arhati

3. Yudhishthira said: You, O mighty-armed one (mahābāho), are truly capable of explaining all this: both how a person should act, and what constitutes eternal (sanātana) natural law (dharma).

Words meanings summery:

• यथा (yathā) - how, as, in which manner

• नरेण (nareṇa) - by a man, by a person

• कर्तव्यम् (kartavyam) - to be done, proper duty, what should be done

• यः (yaḥ) - which, who

• च (ca) - and, also

• धर्मः (dharmaḥ) - Eternal (sanātana) natural law. (natural law, constitution, duty, righteousness)

• सनातनः (sanātanaḥ) - Qualifies dharmaḥ. (eternal, everlasting)

• एतत् (etat) - Refers to the preceding two clauses (how a man should act and eternal dharma). (this)

• सर्वम् (sarvam) - All these matters. (all, whole)

• महाबाहो (mahābāho) - Addressed to Bhishma. (O mighty-armed one)

• भवान् (bhavān) - Refers to Bhishma. (you (respectful), your honor)

• व्याख्यातुम् (vyākhyātum) - to explain, to expound

• अर्हति (arhati) - Is capable of (explaining). (is able, is worthy, ought)

Words meanings and morphology

यथा (yathā) - how, as, in which manner

(indeclinable)

Adverb.

Note: Introduces a clause of manner.

नरेण (nareṇa) - by a man, by a person

(noun)

Instrumental, masculine, singular of nara

nara - man, human, person

Note: Agent of the gerundive kartavyam.

कर्तव्यम् (kartavyam) - to be done, proper duty, what should be done

(adjective)

Nominative, neuter, singular of kartavya

kartavya - to be done, to be made, proper, duty

gerundive

From root kṛ (to do, to make) with -tavya suffix.

Root: kṛ (class 8)

Note: Implies "what should be done".

यः (yaḥ) - which, who

(pronoun)

Nominative, masculine, singular of yad

yad - which, who, what

Relative pronoun.

Note: Refers to dharmaḥ.

च (ca) - and, also

(indeclinable)

Conjunction.

Note: Postpositive conjunction.

धर्मः (dharmaḥ) - Eternal (sanātana) natural law. (natural law, constitution, duty, righteousness)

(noun)

Nominative, masculine, singular of dharma

dharma - constitution, natural law, intrinsic nature, duty, righteousness

From root dhṛ (to uphold, support).

Root: dhṛ (class 1)

Note: Subject of implied asti.

सनातनः (sanātanaḥ) - Qualifies dharmaḥ. (eternal, everlasting)

(adjective)

Nominative, masculine, singular of sanātana

sanātana - eternal, everlasting, ancient

From sanā (always) + suffix tana.

Note: Qualifies dharmaḥ.

एतत् (etat) - Refers to the preceding two clauses (how a man should act and eternal dharma). (this)

(pronoun)

Accusative, neuter, singular of etad

etad - this, that

Demonstrative pronoun.

Note: Direct object of vyākhyātum.

सर्वम् (sarvam) - All these matters. (all, whole)

(pronoun)

Accusative, neuter, singular of sarva

sarva - all, every, whole

Universal pronoun.

Note: Qualifies etat.

महाबाहो (mahābāho) - Addressed to Bhishma. (O mighty-armed one)

(adjective)

Vocative, masculine, singular of mahābāhu

mahābāhu - mighty-armed, strong-armed

Compound of mahā (great) + bāhu (arm).

Compound type : bahuvrihi (mahā+bāhu)

• mahā – great, large, mighty
  adjective
• bāhu – arm
  noun (masculine)

Note: Address to Bhishma.

भवान् (bhavān) - Refers to Bhishma. (you (respectful), your honor)

(pronoun)

Nominative, masculine, singular of bhavat

bhavat - you (polite), your honor; being, existing

present active participle

From root bhū (to be, exist). Used as a respectful second-person pronoun.

Root: bhū (class 1)

Note: Subject of arhati.

व्याख्यातुम् (vyākhyātum) - to explain, to expound

(verb)

active

infinitive

From root khyā (to tell, relate) with vi-ā prefixes.

Prefixes: vi+ā

Root: khyā (class 2)

Note: Infinitive complementing arhati.

अर्हति (arhati) - Is capable of (explaining). (is able, is worthy, ought)

(verb)

3rd person , singular, active, present (lat) of arh

Third person singular present active indicative.

Root: arh (class 1)

Note: Main verb of the sentence.