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Questions & Answers about Usiądźmy z tyłu.
How do we form the "let's" command in usiądźmy?
The suffix -my is added to the base imperative form usiądź (sit down). In Polish, you create "let's" commands simply by adding -my to the command form you would use for a single person (the informal "you").
Why do we use the perfective verb usiąść here instead of the imperfective siadać?
We use the perfective form because taking a seat is a single, completed action here. If you used the imperfective siadajmy, it would focus on the ongoing process of sitting down, which isn't what you usually mean when picking a spot in a room or car.
Why does z tyłu translate to "at the back" if z usually means "from" or "with"?
In Polish, static locations are sometimes described by where the space originates. z tyłu literally translates as "from the rear," but it is the standard fixed phrase for "in the back" or "at the back". You will see the exact same logic in the opposite phrase, z przodu (in the front).
What case is the word tyłu in this phrase?
It is in the genitive case. The base noun is tył (the back or rear). The preposition z requires the genitive case when it carries the meaning of "from", which changes the ending of tył to tyłu.