Sine societate et fide magnum opus perfici non potest.

Because sine (without) takes the ablative case in Latin. So:

• societas → societate = without partnership / cooperation / association
• fides → fide = without faith / trust / loyalty

A learner should get used to pairing sine with the ablative, just as English speakers naturally pair without with a noun phrase.

Sine means without. It introduces the condition that is lacking.

So sine societate et fide means without cooperation and trust/faith.

Latin often puts this kind of prepositional phrase near the front of the sentence to set the scene first.

Because the phrase is governed by sine, and sine requires the ablative, not the accusative.

So:

• wrong here: societatem, fidem (accusative)
• correct here: societate, fide (ablative)

This is a very common point for English speakers, since English does not mark case this way on nouns.

Not usually in the modern sense of society as a whole social system.

Societas can mean things like:

• association
• partnership
• alliance
• cooperation

In this sentence, cooperation or partnership is probably the most natural sense.

It can mean either, depending on context. Fides is a rich Latin word and can include:

• faith
• trust
• reliability
• good faith
• loyalty

In this sentence, trust or good faith often fits well, especially alongside societate. But faith is not wrong if the broader context supports it.

Because opus is a neuter noun.

The adjective magnus, magna, magnum must agree with the noun it modifies in gender, number, and case. Since opus is:

• neuter
• singular
• here in the nominative

the adjective must also be neuter singular nominative:

• magnum opus = a great work

It is nominative singular, and it functions as the subject of the sentence.

Even though in English we might think of a great work as the thing being accomplished, in Latin this sentence is built with a passive infinitive plus potest:

• magnum opus = the thing that cannot be accomplished

So the grammatical subject is magnum opus.

Because it goes with potest.

This is the common Latin pattern:

• possum = I am able / can
• followed by an infinitive

Here:

• potest = is able / can
• perfici = to be completed / to be accomplished

Together, perfici non potest means cannot be accomplished.

Perfici is the present passive infinitive of perficio.

Basic parts:

• perficio = I complete, finish, accomplish
• perfici = to be completed / to be accomplished

So the sentence does not mean cannot accomplish, but cannot be accomplished.

Latin normally forms negation by putting non before the verb:

• potest = can / is able
• non potest = cannot / is not able

So perfici non potest literally means to be accomplished it is not able, but in good English: cannot be accomplished.

Because et simply means and and links the two ablative nouns:

• sine societate et fide = without cooperation and trust

This is straightforward coordination. Both nouns depend equally on sine.

The word order is flexible, but it is meaningful in emphasis and style.

The sentence begins with:

• Sine societate et fide = Without cooperation and trust

This foregrounds the missing conditions first. Then we get:

• magnum opus = a great work
• perfici non potest = cannot be accomplished

So the order helps the sentence unfold rhetorically:

1. first, what is lacking
2. then, what is at stake
3. finally, the result

Latin often uses word order this way more freely than English does.

Yes. Opus can mean:

• work
• task
• deed
• project
• achievement
• sometimes even a work in the sense of a literary or artistic creation

So magnum opus can be read broadly as a great undertaking or great work. Context decides how concrete or abstract it is.

Because magnum opus is singular: a great work, not great works.

If the sentence were plural, you would expect forms like:

• magna opera = great works
• perfici non possunt = cannot be accomplished

But here everything is singular:

• magnum opus
• potest

So the grammar is consistent.

Yes, Latin word order is flexible enough for that. You could see:

• magnum opus perfici non potest
• magnum opus non potest perfici

Both would be understandable.

The given order places perfici before non potest, which is a normal and elegant way to keep the infinitive closely tied to potest while leaving the negation to modify the finite verb clearly.