Sponsio mea parva est, sed factio vincit.

Because both words are agreeing with sponsio, which is a feminine singular noun.

In Latin, adjectives and possessives usually agree with the noun they modify in:

• gender
• number
• case

So:

• sponsio = feminine singular nominative
• mea = feminine singular nominative, agreeing with sponsio
• parva = feminine singular nominative, also agreeing with sponsio

An English speaker may expect something more fixed, but Latin makes these relationships clear through endings.

Because parva is describing sponsio, and sponsio is feminine.

• parvus = masculine
• parva = feminine
• parvum = neuter

Since sponsio is feminine, the adjective must be feminine too: parva.

Also, in this sentence parva is a predicate adjective after est, but it still agrees with the subject.

Both are nominative singular here, because each is the subject of its own clause.

• Sponsio mea parva est → sponsio is the subject of est
• sed factio vincit → factio is the subject of vincit

A useful habit in Latin is to look for the finite verb first, then ask what noun is in the nominative and matches it as the subject.

Est is the 3rd person singular present of sum, meaning is.

Here it is a linking verb: it links the subject sponsio mea with the description parva.

So the structure is:

• subject: sponsio mea
• linking verb: est
• predicate adjective: parva

This is the same basic pattern as:

• Puella laeta est = the girl is happy
• Via longa est = the road is long

Because Latin has no articles.

So a noun like factio can mean, depending on context:

• a faction
• the faction
• sometimes just faction

The same is true for sponsio. English requires an article much more often than Latin does, so when reading Latin you often have to supply a/an/the from context.

Latin word order is much more flexible than English word order.

So both of these are possible:

• sponsio mea
• mea sponsio

Both can mean my bet / my promise / my pledge, depending on context.

In many ordinary phrases, possessive adjectives often come after the noun, so sponsio mea is perfectly natural. Changing the order can add emphasis or just reflect style.

Because the ending of the verb already tells you the person and number.

Vincit means he/she/it wins or is winning.

The -t ending marks 3rd person singular. So Latin usually does not need to add a subject pronoun unless it wants emphasis or contrast.

That means:

• vincit = he/she/it wins
• ea vincit = she wins or that one wins, with more explicit emphasis

In your sentence, factio is already present as the subject, so no pronoun is needed.

Both are present indicative active.

• est = is
• vincit = wins / is winning

So the sentence describes a present situation:

• my bet is small
• but the faction wins

As often in Latin, the present tense can sometimes sound a little broader in English depending on context, but the basic tense here is straightforwardly present.

Yes. Both are third-declension feminine nouns ending in -io in the nominative singular.

Their dictionary forms would typically look like this:

• sponsio, sponsionis f.
• factio, factionis f.

That means the -io form is nominative singular, and the stem shows up more clearly in the genitive:

• sponsion-
• faction-

This is a useful pattern to recognize, because many third-declension nouns look similar in the nominative but reveal their stem in the genitive.

Yes, to a degree.

Latin relies much more on endings than English does, so several word orders are possible without changing the core meaning. For example:

• Mea sponsio parva est, sed factio vincit.
• Sponsio mea est parva, sed factio vincit.
• Sponsio mea parva est, sed vincit factio.

These all keep the same basic grammar, though the emphasis may shift slightly.

A few general points:

• sed still introduces the contrast
• sponsio remains the subject of est
• factio remains the subject of vincit

So Latin word order is flexible, but not random: writers use it to shape emphasis, rhythm, and style.

Sed is the conjunction but.

It joins two independent clauses and marks a contrast between them:

• Sponsio mea parva est
• factio vincit

So the sense is: one thing is true, but another contrasting thing is also true.

This is a very common Latin conjunction, and it works much like English but.