Poteva assistere al convegno, ma ha dovuto rifiutare.

Questions & Answers about Poteva assistere al convegno, ma ha dovuto rifiutare.

Why use the imperfetto for poteva instead of the passato prossimo (ha potuto)?
The imperfetto form poteva describes a past state or ongoing condition. It tells us he had the opportunity or ability to attend, but it leaves the actual outcome open. If the sentence used ha potuto, it would mean he managed to attend and the action of attending was successfully completed.
Why does the sentence switch to the passato prossimo for ha dovuto?
Ha dovuto is used because it represents a specific, completed event. He was forced by circumstances to make a decision, and he definitively carried out the refusal. If we used the imperfetto (doveva), it would just mean he 'was supposed to' refuse, leaving it a mystery whether he actually did.
Doesn't assistere mean 'to assist'? Why is it translated as 'to attend'?
This is a classic 'false friend.' While assistere can mean providing medical or technical care, when it is followed by the preposition a (as it is here), it means 'to attend' or 'to be a spectator at' an event, meeting, or show. If you want to say 'to help,' you'll usually want the verb aiutare.
Why do we say al convegno instead of just il convegno?
Because the verb assistere requires the preposition a when it means 'to attend' (assistere a qualcosa). Since convegno (conference) takes the masculine singular article il, the preposition a combines with il to create the combined preposition al.

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