In short: Lithuanian personal pronouns decline by case, while possessive pronouns (mano, tavo…) don’t. Below is a reference: personal, possessive, reflexive and demonstrative pronouns in one place — with notes on what you actually need for A2 and which points can be tricky.

Personal pronouns

Singular

Case (question)IyouhesheExample
Nominative (kas? — who?)aštujisjiAš einu (I go)
Genitive (ko? — whose?)manęstavęsjojosdėl manęs (for my sake)
Dative (kam? — to whom?)mantaujamjaiMan patinka (I like it)
Accusative (ką? — whom?)manetavejįjąmyli mane (loves me)
Instrumental (kuo? — with whom?)manimitavimijuojatikiu tavimi (I trust you)
Locative (kur? — where?)manyjetavyjejamejoje—

Plural

Case (question)weyouthey (m.)they (f.)Example
Nominative (kas?)mesjūsjiejosmes mokomės (we study)
Genitive (ko?)mūsųjūsųjųjųbe jūsų (without you)
Dative (kam?)mumsjumsjiemsjoms—
Accusative (ką?)musjusjuosjaspas mus (to us)
Instrumental (kuo?)mumisjumisjaisjomisties mumis (towards us)
Locative (kur?)mumysejumysejuosejose—
Kur jie?
men or a mixed group
Kur jos?
women & feminine-gender things

jie or jos? “They” in Lithuanian depends on gender. About forks (šakutės) you’d ask “Kur jos?”, but if there’s a spoon among them (šaukštas, masculine) — then “Kur jie?”. A single masculine item in the group is enough to make “they” jie.

Possessive pronouns

Possessive pronouns don’t decline — one form for every case, gender and number.

myyourhisherouryour (pl.)theirone’s own
manotavojojosmūsųjūsųjųsavo
jo (his), jos (her) and jų (their) are the same forms as the genitive of the personal pronouns (table above).

The reflexive pronoun “oneself"

The word savęs (“oneself”) declines like tavęs but starts with s-. It has no nominative form.

CaseoneselfExample
Genitive (ko?)savęsdėl savęs (for one’s own sake)
Dative (kam?)sau—
Accusative (ką?)saveAš save myliu (I love myself)
Instrumental (kuo?)saviminepasitiki savimi (doesn’t trust oneself)
Locative (kur?)savyje—

Demonstratives: “this”, “that”, “that over there"

All three demonstratives side by side, so every form is in front of you: šis (this, near), tas (that, neutral), anas (that one, far). They decline almost like adjectives.

Masculine

Case (question)this (šis)that (tas)that, far (anas)Example
Singular
Nominative (kas?)šistasanasTas, aukštas (that tall one)
Genitive (ko?)šiotoano—
Dative (kam?)šiamtamanam—
Accusative (ką?)šįtąanąPakabink šį prietaisą (hang this device)
Instrumental (kuo?)šiuotuoanuo—
Locative (kur?)šiametameaname—
Plural
Nominative (kas?)šietieanie—
Genitive (ko?)šiųtųanų—
Dative (kam?)šiemstiemsaniems—
Accusative (ką?)šiuostuosanuos—
Instrumental (kuo?)šiaistaisanais—
Locative (kur?)šiuosetuoseanuose—

Feminine

Case (question)this (ši)that (ta)that, far (ana)Example
Singular
Nominative (kas?)šitaanaAr tau patinka ši paprika? (do you like this pepper?)
Genitive (ko?)šiostosanos—
Dative (kam?)šiaitaianai—
Accusative (ką?)šiątąaną—
Instrumental (kuo?)šiataana—
Locative (kur?)šiojetojeanoje—
Plural
Nominative (kas?)šiostosanos—
Genitive (ko?)šiųtųanų—
Dative (kam?)šiomstomsanoms—
Accusative (ką?)šiastasanas—
Instrumental (kuo?)šiomistomisanomis—
Locative (kur?)šiosetoseanose—