Tive um problema urgente, por isso desmarquei o compromisso.

Questions & Answers about Tive um problema urgente, por isso desmarquei o compromisso.

How does por isso work in this sentence to mean "so"?
Por isso translates literally to "for that," but it is used exactly like "so" or "therefore" in English to show the consequence of an action. It connects two complete thoughts: the cause (tive um problema urgente) and the result (desmarquei o compromisso).
Why is it um problema? Doesn't the -a at the end make it feminine?
Normally, words ending in -a are feminine, but problema is a classic exception! Many Portuguese words of Greek origin ending in -ema or -ama (like o problema, o programa, o sistema) are masculine, which is why we must use the masculine article um.
Why are both tive and desmarquei in the simple past (pretérito perfeito)?
While having a problem can sometimes be a background description using the ongoing past (imperfeito), here tive is used because getting the problem was a sudden, completed event. It acted as the immediate trigger for the next completed action: canceling (desmarquei) the appointment.
How does the word desmarquei mean "I canceled"?
The base verb is marcar, which means "to schedule" or "to book". Adding the prefix des- reverses the action, similar to "un-" in English. Therefore, desmarcar means "to un-schedule" or cancel. Desmarquei is the "I" form in the simple past tense.

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