Stavo per uscire, perché credevo che la spia avesse smesso di sorvegliare la strada.

Questions & Answers about Stavo per uscire, perché credevo che la spia avesse smesso di sorvegliare la strada.

Why do we use the pluperfect subjunctive (avesse smesso) here instead of the imperfect subjunctive (smettesse)?
The main verb credevo (I believed) is in the past and triggers the subjunctive. Because the spy stopped watching the street before you formed that belief, you must use the pluperfect subjunctive (avesse smesso) to show this earlier timeframe. If you used the imperfect subjunctive (smettesse), it would mean the spy was stopping at the exact same time you were believing it.
What is the grammatical structure behind stavo per uscire?
This sentence uses the construction stare per followed by an infinitive verb, which means "to be about to" do something. Because the action was in the past ("I was about to"), the verb stare is conjugated in the imperfect tense as stavo.
Why is there a di between smesso and sorvegliare?
In Italian, certain verbs require a specific preposition to connect to another infinitive verb. The verb smettere (to stop or quit) must always be followed by di when you want to say that someone stopped doing an action.
Since la spia (the spy) is a feminine noun, why doesn't the past participle change to smessa?
Because the auxiliary verb used here is avere (avesse). When forming compound tenses with avere, the past participle (in this case, the irregular participle smesso) ends in -o and does not change to match the subject's gender or number.

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