Mensor perpendiculum portat.

The subject is mensor because it is in the nominative singular form.

In Latin, the subject is usually marked by its case ending, not just by word order. Here:

• mensor = nominative singular = the surveyor / the measurer
• perpendiculum = accusative singular = the direct object
• portat = he/she/it carries

So mensor is the one doing the action.

Here perpendiculum is the direct object, so it is in the accusative singular.

It belongs to the second declension neuter, and in that declension the nominative singular and accusative singular are often the same. So perpendiculum can look the same whether it is the subject or the object, but in this sentence the meaning and structure show that it is the object of portat.

So:

• perpendiculum = a plumb line / plumb bob
• in this sentence, it is the thing being carried

Portat is:

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

It comes from the verb portare, meaning to carry.

So portat means:

• he carries
• she carries
• it carries
• sometimes also is carrying, depending on context

Since the subject is mensor, the natural translation is the surveyor carries or the surveyor is carrying.

Latin usually does not use articles like English the and a/an.

So mensor can mean:

• the surveyor
• a surveyor

And perpendiculum can mean:

• the plumb line
• a plumb line

Which one is best depends on context. A single Latin sentence often leaves that unspecified.

It matters less in Latin than in English, because Latin uses endings to show each word’s job in the sentence.

So this sentence could be rearranged in different ways, such as:

• Mensor perpendiculum portat
• Perpendiculum mensor portat
• Portat mensor perpendiculum

All of these can still mean essentially the same thing, because:

• mensor is still nominative
• perpendiculum is still accusative
• portat is still the verb

That said, word order in Latin can change the emphasis. The original order is straightforward and easy for a learner.

Yes.

The Latin present tense often covers both:

• simple present: carries
• progressive present: is carrying

So Mensor perpendiculum portat could mean either:

• The surveyor carries a plumb line
• The surveyor is carrying a plumb line

Context would decide which is better in real use.

Mensor is a third-declension masculine noun.

Its basic meaning is measurer or surveyor. In practical Latin, it often refers to someone who measures land or works with measuring tools.

The ending -or is common in Latin nouns that refer to a person who does something, similar to English words like actor or sailor.

Because in Latin, the verb ending already includes the subject information.

In portat, the ending -t tells you the verb is third person singular:

• he carries
• she carries
• it carries

That means Latin usually does not need a separate subject pronoun like he or she unless it is being emphasized.

So instead of saying something like he carries, Latin can simply say portat.

A simple classroom pronunciation would be:

MEN-sor per-pen-DIK-oo-lum POR-tat

More roughly, word by word:

• mensor = MEN-sor
• perpendiculum = per-pen-DIK-oo-lum
• portat = POR-tat

If you are using restored Classical pronunciation, the c in Latin is always hard, but there is no c in this sentence, so that issue does not arise here.

It is a specific measuring tool.

Perpendiculum refers to a plumb line or plumb bob, a tool used to check whether something is truly vertical. That fits well with mensor, since a surveyor or measurer would use such an instrument.

So the sentence is not just about carrying a random object; it describes a person carrying a tool used for measurement.

Yes, grammatically it could.

The Latin present tense can sometimes be translated in several English ways:

• carries
• is carrying
• does carry

But does carry is less neutral in English and usually sounds emphatic. Unless the context especially needs emphasis, carries or is carrying is usually the best choice.