Ego quoque calendario utor, quia sine eo facile obliviscor utrum November an December sit.

Yes, Latin could leave ego out, because the ending of utor already tells you the subject is I.

So why include ego? Usually for emphasis or contrast. Here ego quoque means I too / I also, with a little extra stress on I. It suggests something like:

• I too use a calendar
• I also use a calendar

Without ego, the sentence would still be grammatical, but slightly less emphatic.

Quoque usually comes after the word it emphasizes.

So:

• ego quoque = I too
• if it followed some other word, it would emphasize that word instead

This is a very common Latin pattern. English often puts too or also later in the sentence, but Latin quoque tends to sit directly after the element it belongs to.

Because utor is one of those Latin verbs that takes the ablative, not the accusative.

So:

• calendarium = nominative/accusative singular
• calendario = ablative singular

After utor, the correct form is calendario.

This is something English speakers often have to get used to, because English use takes a direct object, but Latin utor does not work that way.

Utor is a deponent verb.

That means:

• it has passive-looking forms
• but an active meaning

So utor looks as if it might mean I am used, but it actually means I use.

This is very normal in Latin. A learner should simply memorize utor, uti, usus sum as a verb meaning use and remember that it governs the ablative.

Eo refers back to calendario: without it, that is, without the calendar.

A few things are happening here:

• sine means without
• sine takes the ablative
• the pronoun referring back to calendario therefore also appears in the ablative

Since calendarium is neuter, the pronoun is neuter too:

• nominative/accusative: id
• ablative: eo

So sine eo literally means without it.

Both can mean it, but they are not exactly the same.

• eo is from is, ea, id, the common weaker demonstrative pronoun
• illo is from ille, illa, illud, which is more strongly demonstrative: that, that one

Here Latin is just referring back to the previously mentioned calendar in a simple way, so eo is the natural choice.

Because facile can function as an adverb meaning easily.

With many third-declension adjectives, learners expect an adverb in -iter, and faciliter does exist. But facile is also a standard and very common adverbial form.

So facile obliviscor means I easily forget.

Yes. Obliviscor is also deponent.

So:

• it looks passive in form
• but means I forget

Its dictionary forms are usually given as obliviscor, oblivisci, oblitus sum.

English speakers often notice that both main verbs in this sentence, utor and obliviscor, are deponent. That is perfectly possible in Latin, even if it feels unusual at first.

Because Latin, like English, can say not only I forget something, but also I forget whether...

Here the thing forgotten is not a single noun, but an indirect question:

• utrum November an December sit
• whether it is November or December

So the sentence means that the speaker forgets which month it is.

Utrum ... an ... introduces a choice between two alternatives:

• whether ... or ...

So:

• utrum November an December sit
• whether it is November or December

This is a very common Latin way to express an either/or question, especially in indirect questions.

Because this is an indirect question, and Latin normally puts the verb of an indirect question in the subjunctive.

The direct question would be something like:

• November an December est?
• Is it November or December?

But after a verb like obliviscor, Latin turns that into an indirect question, so the verb becomes subjunctive:

• ... utrum November an December sit

So the subjunctive here is not mainly about doubt or unreality; it is the normal grammar of indirect questions.

Here they are in the nominative, because they are predicate nouns with sit:

• whether it is November or December

In effect, the sentence means:

• whether the month is November or December
• or simply whether it is November or December

So the month names stand as the names of what it is.

Also, these are not English words awkwardly dropped into Latin by accident: November and December are themselves Latin month names, which English inherited.

The word order is quite natural for Latin.

Latin often places the verb at or near the end, especially in subordinate clauses. So:

• utrum November an December sit

with sit at the end feels very normal.

More generally, Latin word order is flexible. The endings do much of the grammatical work, so the arrangement of words often reflects emphasis and style rather than strict syntactic necessity.

No, not here.

In English, once the object is understood, we can sometimes say something like because without it I forget or even just because without one I forget, depending on context. In Latin, after sine you need an expressed object if you mean without it.

So sine eo is necessary to make clear that the speaker means without the calendar.