Gn 8:5 At vero aquæ ibant et decrescebant usque ad decimum mensem: decimo enim mense, primo die mensis, apparuerunt cacumina montium.
But indeed the waters were going and diminishing until the tenth month: for in the tenth month, on the first day of the month, the tops of the mountains appeared.
| # | Latin | Gloss | Grammar Tag | 
|---|---|---|---|
| 1 | At | but | CONJ.ADV | 
| 2 | vero | indeed / truly | ADV.EMPH | 
| 3 | aquæ | waters | NOUN.NOM.PL.F | 
| 4 | ibant | were going | VERB.3PL.IMPERF.IND.ACT | 
| 5 | et | and | CONJ | 
| 6 | decrescebant | were diminishing | VERB.3PL.IMPERF.IND.ACT | 
| 7 | usque | until | PREP+ACC | 
| 8 | ad | to / until | PREP+ACC | 
| 9 | decimum | tenth | ADJ.ACC.SG.M | 
| 10 | mensem | month | NOUN.ACC.SG.M | 
| 11 | decimo | in the tenth | ADJ.ABL.SG.M | 
| 12 | enim | for | CONJ.EXPL | 
| 13 | mense | in the month | NOUN.ABL.SG.M | 
| 14 | primo | first | ADJ.ABL.SG.M | 
| 15 | die | day | NOUN.ABL.SG.M | 
| 16 | mensis | of the month | NOUN.GEN.SG.M | 
| 17 | apparuerunt | appeared | VERB.3PL.PERF.IND.ACT | 
| 18 | cacumina | tops / summits | NOUN.NOM.PL.N | 
| 19 | montium | of the mountains | NOUN.GEN.PL.M | 
Syntax
The opening clause At vero aquæ ibant et decrescebant uses the imperfect tense twice (ibant, decrescebant) to depict continuous action — the gradual retreat of the waters.
The prepositional phrase usque ad decimum mensem indicates duration up to a specific time limit (“until the tenth month”).
The second clause, introduced by the explanatory enim (“for”), clarifies the moment when visible land reappears: decimo enim mense, primo die mensis, apparuerunt cacumina montium.
Here, apparuerunt serves as the main verb, with cacumina montium (nominative + genitive) as its subject phrase, marking the first sign of post-diluvian hope — the mountain peaks emerging from beneath the floodwaters.
Morphology
- At — Lemma: at; Part of Speech: Conjunction; Form: indeclinable; Function: introduces contrastive clause; Translation: but; Notes: contrasts the previous rest of the ark with continued water movement.
 - vero — Lemma: vero; Part of Speech: Adverb; Form: indeclinable; Function: emphasizes affirmation; Translation: indeed / truly; Notes: adds strength to the contrast introduced by At.
 - aquæ — Lemma: aqua; Part of Speech: Noun; Form: nominative plural feminine; Function: subject of ibant and decrescebant; Translation: waters; Notes: agent of natural recession.
 - ibant — Lemma: eo; Part of Speech: Verb; Form: 3rd person plural imperfect indicative active; Function: main verb; Translation: were going; Notes: imperfect marks continuous retreat.
 - et — Lemma: et; Part of Speech: Conjunction; Form: indeclinable; Function: coordinates verbs; Translation: and; Notes: links twin processes of motion and reduction.
 - decrescebant — Lemma: decresco; Part of Speech: Verb; Form: 3rd person plural imperfect indicative active; Function: main verb; Translation: were diminishing; Notes: describes gradual lessening of floodwaters.
 - usque — Lemma: usque; Part of Speech: Preposition / Adverb; Form: governs ad + accusative; Function: emphasizes continuity; Translation: until; Notes: forms temporal boundary phrase with ad.
 - ad — Lemma: ad; Part of Speech: Preposition; Form: governs accusative; Function: introduces terminus of motion or time; Translation: to / until; Notes: paired with usque for duration.
 - decimum — Lemma: decimus; Part of Speech: Adjective (ordinal); Form: accusative singular masculine; Function: modifies mensem; Translation: tenth; Notes: indicates month number.
 - mensem — Lemma: mensis; Part of Speech: Noun; Form: accusative singular masculine; Function: object of ad; Translation: month; Notes: marks the end of the period of diminishing waters.
 - decimo — Lemma: decimus; Part of Speech: Adjective (ordinal); Form: ablative singular masculine; Function: ablative of time when; Translation: in the tenth; Notes: temporal specification of the next clause.
 - enim — Lemma: enim; Part of Speech: Conjunction; Form: indeclinable; Function: introduces explanation; Translation: for; Notes: provides reason or clarification for prior statement.
 - mense — Lemma: mensis; Part of Speech: Noun; Form: ablative singular masculine; Function: ablative of time when; Translation: in the month; Notes: paired with ordinal for temporal expression.
 - primo — Lemma: primus; Part of Speech: Adjective (ordinal); Form: ablative singular masculine; Function: modifies die; Translation: first; Notes: indicates first day of the tenth month.
 - die — Lemma: dies; Part of Speech: Noun; Form: ablative singular masculine; Function: ablative of time when; Translation: day; Notes: continues the chronological specificity.
 - mensis — Lemma: mensis; Part of Speech: Noun; Form: genitive singular masculine; Function: genitive of relation; Translation: of the month; Notes: clarifies temporal framework.
 - apparuerunt — Lemma: appareo; Part of Speech: Verb; Form: 3rd person plural perfect indicative active; Function: main verb of the final clause; Translation: appeared; Notes: perfect indicates completed emergence.
 - cacumina — Lemma: cacumen; Part of Speech: Noun; Form: nominative plural neuter; Function: subject of apparuerunt; Translation: tops / summits; Notes: neuter plural subject denoting visible peaks.
 - montium — Lemma: mons; Part of Speech: Noun; Form: genitive plural masculine; Function: genitive of possession; Translation: of the mountains; Notes: specifies the summits seen after the flood’s retreat.