Breakdown of Ti sembra che il software funzioni?
ti
to you
che
that (conjunction introducing a clause)
funzionare
to work / to function (machines, devices)
sembrare
to seem
Questions & Answers about Ti sembra che il software funzioni?
Is sembra used personally or impersonally in this sentence?
It is used impersonally. The verb sembra is in the third-person singular meaning 'it seems' rather than referring to a specific subject. It is paired with the indirect object pronoun ti (to you) and introduces a dependent clause starting with che.
How would this sentence look if we used the personal construction of sembrare?
You could say Il software ti sembra funzionare?. In the personal construction, the item being discussed (il software) becomes the direct subject of sembra, and the action it performs is expressed with an infinitive (funzionare) without using che.
Why is the verb funzionare conjugated as funzioni?
It is in the present subjunctive mood. Impersonal expressions of opinion or impression, like sembra che or pare che, require the subjunctive in the dependent clause because they express subjective perception rather than objective fact.