Opinor propinquos nostros iam focum parare et hospitium calidum habere.

Because opinor is a deponent verb. Deponent verbs use passive-looking forms but have active meanings.

So:

• opinor = I think / I suppose
• not I am thought

Its dictionary form is opinor, opinari, opinatus sum. In this sentence, opinor is:

• 1st person singular
• present tense
• indicative mood

So the main clause is simply I think.

Because Latin often uses the accusative + infinitive construction after verbs of thinking, saying, knowing, perceiving, and similar verbs.

After opinor (I think), the thing being thought is not usually expressed as a full clause with a finite verb. Instead, Latin says:

• accusative subject
  • infinitive verb

So:

• propinqui nostri would mean our relatives as a normal nominative subject
• propinquos nostros means our relatives as the subject of the infinitives in indirect statement

In other words, English says:

• I think that our relatives are preparing...

Latin says:

• I think our relatives to be preparing...

That is why propinquos nostros is accusative.

They are infinitives because they are part of an indirect statement after opinor.

Latin commonly expresses I think that... with:

• a main verb of thinking: opinor
• an accusative subject: propinquos nostros
• infinitives: parare and habere

So instead of a finite verb such as parant or habent, Latin uses infinitives:

• parare = to prepare
• habere = to have

This is one of the most important Latin constructions to learn: verb of thinking/saying + accusative subject + infinitive.

The subject of both infinitives is propinquos nostros.

So the sentence means that our relatives are doing both actions:

• parare = preparing the hearth/fire
• habere = having warm lodging/hospitality

Latin does not need to repeat the subject before the second infinitive, because it is understood to be the same.

Nostros agrees with propinquos.

Both are:

• masculine
• plural
• accusative

So:

• propinquos = relatives / kinsmen / near ones
• nostros = our

Together they mean our relatives.

This agreement is normal for adjectives and possessives in Latin: they match the noun in gender, number, and case.

Propinquus literally has the idea of someone near or closely connected. Depending on context, it can mean:

• relative
• kinsman
• close relation
• sometimes more generally neighbor or someone nearby

In this sentence, propinquos nostros is most naturally our relatives or our kinsfolk.

Iam usually means now, already, or sometimes by now, depending on context.

Here it suggests that the action is happening already / by this time / now.

Latin adverbs like iam are fairly flexible in position. It appears before the infinitive phrase here, but it could often be placed elsewhere without changing the basic meaning much.

So iam modifies the idea of the relatives already being engaged in these actions.

Focum is the accusative singular of focus, which means:

• hearth
• fireplace
• by extension, sometimes fire

Parare means to prepare, get ready, provide, or make ready.

So focum parare means something like:

• to prepare the hearth
• to get the fire ready
• to prepare a fire

Exactly how you phrase it in English depends on the context.

Hospitium can mean several related things, such as:

• hospitality
• lodging
• guest-room
• accommodation

In this sentence, it probably means something like lodging or hospitality offered to a guest.

So hospitium calidum habere suggests having:

• warm lodging
• a warm place to stay
• warm hospitality

The exact English wording depends on the context already given to the learner.

Because calidum agrees with hospitium.

Hospitium is:

• neuter
• singular
• accusative

So the adjective must also be:

• neuter
• singular
• accusative

That gives calidum.

This is another example of normal Latin adjective agreement.

Et connects the two infinitive phrases:

• focum parare
• hospitium calidum habere

So the sentence says that our relatives are thought to be doing both things:

1. preparing the hearth/fire
2. having warm lodging/hospitality ready

The shared subject for both is still propinquos nostros.

The word order is perfectly normal for Latin. Latin word order is much freer than English word order because the endings show the grammatical relationships.

This sentence begins with the main idea:

• Opinor = I think

Then it gives the indirect statement:

• propinquos nostros = subject of the infinitives
• iam = already / now
• focum parare et hospitium calidum habere = the actions

Latin could rearrange some parts without changing the core meaning very much. For example, iam could appear in a different place, and adjectives sometimes come before or after nouns.

But the given order is natural and easy to follow: main verb first, then the accusative-and-infinitive construction.

Classical Latin normally prefers the accusative + infinitive after verbs like opinor.

So:

• Opinor propinquos nostros... parare... habere

is the standard classical way to say:

• I think that our relatives are preparing... and have...

Later Latin and some less formal usage may use clause constructions more like English, but for a learner of standard Latin, the important pattern is:

• opinor
  • accusative subject
    • infinitive

So this sentence is an excellent example of the normal classical construction.