Trochlea movetur quasi funis torculus frangatur.

The sentence has:

• a main clause: Trochlea movetur
• a subordinate clause of comparison: quasi funis torculus frangatur

So grammatically, the structure is:

• trochlea = subject of movetur
• movetur = main verb
• quasi = as if / as though
• torculus = subject of frangatur
• funis = most naturally dependent on torculus
• frangatur = verb of the quasi-clause

In other words, the first part states what is happening, and the quasi-clause describes how it seems.

Trochlea is nominative singular.

You can tell because it is the subject of movetur. The verb movetur is third person singular, so it needs a singular subject, and trochlea is the noun that fits that role.

For a learner, the simplest way to read the main clause is:

• trochlea = the thing doing or undergoing the action
• movetur = is moved / moves

Movetur is:

• third person singular
• present tense
• passive voice
• indicative mood

It comes from moveo, movere.

So literally it means is moved. Depending on context, English may sometimes express the idea more naturally as simply moves, but the Latin form itself is passive.

Quasi introduces a comparison based on appearance, impression, or resemblance. It usually means:

• as if
• as though

So the clause after quasi does not present something as a plain fact. Instead, it presents something as the way the action seems.

That is why this word is important: it tells you not to read the second clause as a separate factual statement, but as a comparison.

Because it stands after quasi in an as if / as though clause.

Latin commonly uses the subjunctive after words like quasi when the clause expresses appearance, supposition, or an imagined comparison rather than a straightforward fact.

So frangatur is not saying flatly it is being broken. It is saying something more like:

• as if it were being broken
• as though it were being broken

That is exactly the kind of idea the subjunctive is good at expressing.

Frangatur is:

• third person singular
• present tense
• passive voice
• subjunctive mood

It comes from frango, frangere.

So, taken very literally, it means something like may be broken or is being broken in a subjunctive setting. But in this sentence, because of quasi, English usually turns it into something like were being broken.

This is a very common question for English speakers.

English often uses a past form after as if even when the meaning is about a present appearance:

• It moves as if it were being broken.

Latin does not have to match that English pattern. Instead, Latin often uses the present subjunctive to show action that is contemporaneous with the main verb.

So:

• movetur = it is moving / is moved
• frangatur = it is, as it were, being broken

English uses were being broken because that is the normal idiom after as if. Latin uses present subjunctive because that is how Latin handles this kind of comparison.

Most likely genitive singular.

This is an important point because funis can look the same in both the nominative singular and the genitive singular.

Why is genitive the better reading here?

Because frangatur needs a subject in the nominative, and torculus is the most natural nominative subject. That makes funis most naturally a dependent genitive:

• funis torculus = the twist/coil of the rope or similar, depending on the vocabulary you were given

So the grammar strongly suggests:

• torculus = subject
• funis = of the rope

Torculus is most naturally the nominative singular subject of frangatur.

That means it is the thing that is being described in the quasi-clause as undergoing the action of frangatur.

So if you are mapping the clause structurally:

• quasi = as if
• funis = of the rope
• torculus = the subject
• frangatur = were being broken

Even if you are still unsure about the exact dictionary nuance of torculus, its grammatical job is clear: it is the noun attached to frangatur.

Because Latin word order is much freer than English word order.

English relies heavily on position:

• subject + verb + object

Latin relies much more on endings. That means the author can arrange words for emphasis, rhythm, or style.

Here, the important signals are not the positions but the forms:

• trochlea goes with movetur
• torculus goes with frangatur
• funis depends on torculus
• quasi introduces the comparison

A more mechanically arranged version might feel easier to an English speaker, but the original order is perfectly normal Latin. The endings tell you who belongs with what.

Yes — that is actually a very good strategy.

If you find the finite verbs first, you get:

• movetur
• frangatur

Then you can build outward:

1. Trochlea movetur
   → one complete clause

2. quasi ... frangatur
   → another clause introduced by quasi

Then ask what noun goes with frangatur. The best answer is torculus, with funis depending on it.

For many learners, that is the easiest way to read a sentence like this:
verbs first, then subjects, then any dependent words.