Breakdown of L'action s'est effondrée, j'aurais dû écouter ton conseil.
je
I
être
to be
avoir
to have
écouter
to listen to
Questions & Answers about L'action s'est effondrée, j'aurais dû écouter ton conseil.
How does j'aurais dû écouter express a regret here?
It uses the past conditional of the verb devoir (to have to / must) followed by the infinitive écouter. Literally, it means 'I would have had to listen,' which is how French says 'I should have listened.' This formula (j'aurais dû + infinitive) is the standard way to express regret about something you failed to do.
Does l'action mean 'the action' here?
Why is there an extra 'e' at the end of effondrée?
The verb s'effondrer is reflexive, which means it must use être as its auxiliary verb in the passé composé (s'est). When a reflexive verb uses être, its past participle generally has to agree with the subject in gender and number. Since l'action is feminine singular, we add an 'e' to make it effondrée.
Why does dû have a circumflex accent (little hat) on it?
The accent distinguishes dû, which is the past participle of devoir (to owe / to have to), from the word du, which is the mandatory contraction of de + le (meaning 'some' or 'of the'). It is simply a spelling rule to prevent you from confusing the two words.