Suus, sua, suum is the Latin reflexive possessive adjective meaning "his own, her own, its own, their own." It always refers back to the subject of its clause, and it agrees in gender, number, and case with the noun it modifies, not with the person who owns the thing.
Suus, sua, suum is the reflexive possessive adjective. It means "his own," "her own," "its own," or "their own," and the owner is always the subject of the clause. So in Caesar suos milites laudat, Caesar is praising his own soldiers, the soldiers belonging to the subject, Caesar.
Here's the part that trips people up. Suus is an adjective, so it declines like a normal first/second declension adjective and agrees with the thing possessed, not the possessor. In regina suas filias amat ("the queen loves her own daughters"), suas is feminine accusative plural because filias is, not because the queen is feminine. The gender and number of suus tell you nothing about who the owner is. The subject of the sentence tells you that. You see suus everywhere in Caesar's Gallic War (think sua sponte, "of their own accord," or tribes defending suis finibus, "their own territory") and throughout Vergil's Aeneid.
AP Latin is a translation-precision exam, and suus is one of the words graders watch. The literal translation FRQs are scored in segments, and a possessive is often its own scoring point. Translate suus as just "his" when the context demands "his own," or worse, attach it to the wrong owner, and you can lose that segment. Suus also matters for reading comprehension in indirect statement, which Caesar uses constantly. Inside indirect speech, suus points back to the person speaking or thinking, so tracking it correctly is how you keep straight whose camp, whose plan, and whose soldiers are being discussed. That skill feeds directly into the exam's core tasks of reading, translating, and analyzing the required Latin passages from Caesar and Vergil.
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Adjective Agreement (all units)
Suus follows the standard agreement rule. It matches the noun it modifies in gender, number, and case. The twist is that its meaning points somewhere else entirely, back to the subject. Suus is the word that proves agreement and reference are two different jobs.
Antecedent (all units)
Just like a relative pronoun needs an antecedent, suus needs a reference point. Its reference point is always the subject of its clause (or the speaker in indirect statement). Reading suus well is really an antecedent-tracking skill.
Caesar's Gallic War (Units 2, 4, 6)
Caesar's battle narrative is full of suus because he's constantly distinguishing "their own forces" from the enemy's. Substantive uses like sui ("his/their own men") show up so often they function almost like a military vocabulary word.
Vergil's Aeneid (Units 1, 3, 5)
Vergil uses suus for emotional weight, characters losing their own city, their own family. Spotting suus helps you in analytical essay work when you're arguing what a character values or grieves.
Suus shows up across the whole exam. On multiple choice, you may get a translation question where the answer choices differ only in who owns what ("his own soldiers" vs. "their soldiers"), or a grammar question asking what suus agrees with or refers to. On the literal translation FRQs, you have to render suus reflexively and pin it to the right owner. "His" vs. "his own" can be the difference in a scoring segment, especially in indirect statement where suus refers to the speaker, not the nearest noun. No released FRQ tests suus in isolation, but it appears constantly inside the required Caesar and Vergil passages you translate, so treat it as a word you must handle automatically.
Both can translate as "his," "her," or "its," but they point at different people. Suus is reflexive and refers to the subject of the clause. Eius is non-reflexive and refers to somebody else. Caesar suos milites laudat means Caesar praises his own soldiers. Caesar eius milites laudat means Caesar praises someone else's soldiers (some other man already mentioned). Also note the grammar difference. Suus is an adjective that declines to agree with the noun, while eius is a fixed genitive form that never changes to match the noun it goes with.
Suus, sua, suum is the reflexive possessive adjective meaning "his own, her own, its own, their own," and the owner is always the subject of the clause.
Suus agrees in gender, number, and case with the thing possessed, so its ending tells you nothing about the gender or number of the owner.
Use suus when the possessor is the subject; use eius (or eorum/earum) when the possessor is someone other than the subject.
In indirect statement, which Caesar uses heavily, suus refers back to the person speaking or thinking, not to the nearest noun.
On translation FRQs, render suus as "his own / their own" when context calls for it, because attaching the possessive to the wrong owner can cost you the scoring segment.
Sui used as a noun (substantive) means "his own men" or "their own people," a pattern Caesar uses constantly in battle scenes.
Suus, sua, suum means "his own," "her own," "its own," or "their own." It's the reflexive possessive adjective, which means the owner is always the subject of the clause it appears in.
Suus refers back to the subject of the clause ("Caesar praises his own soldiers"), while eius refers to someone who is not the subject ("Caesar praises that other man's soldiers"). Suus also declines to agree with its noun; eius is a frozen genitive form that never changes.
The thing owned. In regina suas filias amat, suas is feminine accusative plural to match filias (the daughters), not because the queen is feminine. The subject of the sentence is what identifies the owner.
Yes, suus covers "their own" too. It works for any subject regardless of gender or number, so suis finibus in Caesar means "in their own territory" when the subject is a plural tribe. English needs four different words for what Latin does with one.
No. Se (with forms sui, sibi, se) is the reflexive pronoun meaning "himself/herself/themselves" and stands in for a noun. Suus is the reflexive possessive adjective meaning "his own/their own" and modifies a noun. They share the reflexive logic of pointing back to the subject, but they play different grammatical roles.