Questions & Answers about My idziemy do domu, a inni zostają w bibliotece.
Yes—Polish often drops subject pronouns because the verb ending already shows who is doing the action.
- idziemy = we go / we are going
- zostają = they stay / are staying
So my is not strictly necessary here. It is included for emphasis or contrast. In this sentence, it helps create a clear contrast:
- My idziemy do domu = We are going home
- a inni zostają w bibliotece = and others are staying in the library
So my here feels a bit like we, on the other hand...
Because my is the subject pronoun (we), while idziemy is the verb form (we go / we are going). They are different words with different jobs.
The verb comes from iść (to go), and in the present tense:
- idę = I go
- idziesz = you go
- idzie = he/she/it goes
- idziemy = we go
- idziecie = you all go
- idą = they go
So idziemy is simply the correct we form of iść.