Breakdown of Abre a carrinha, que não posso largar a mesa.
a mesa
the table
não
not / no
abrir
to open
poder
can / may (verb)
Questions & Answers about Abre a carrinha, que não posso largar a mesa.
Why is que used here instead of porque?
Can I always swap porque for que in any sentence?
Why use largar instead of deixar here?
While deixar generally means to leave or to let, largar specifically means to let go of or to release your physical grip on something. Since the speaker is physically holding the table and cannot drop it, largar is the exact verb needed.
Is Abre the command form for você or tu?
It is the informal tu form. For regular verbs, the affirmative tu command looks identical to the normal present tense ele/ela/você form. If you were speaking formally to a você, you would use the present subjunctive form and say Abra a carrinha.