Breakdown of Não acho que sejas capaz de identificar um cogumelo comestível.
não
not / no
um
a / an / some (all forms)
achar
to reckon / to find
que
that (conjunction)
ser capaz de
to be capable of, to be able to
o cogumelo
the mushroom
identificar
to identify
comestível
edible
Questions & Answers about Não acho que sejas capaz de identificar um cogumelo comestível.
Why is sejas in the subjunctive here?
The phrase não acho que expresses doubt or a negative opinion, which triggers the subjunctive. If it were affirmative (acho que), it would take the indicative (és), because stating what you believe is treated as stating a reality in Portuguese.
Since the subject identifying the mushroom is 'you', why is it identificar instead of the personal infinitive identificares?
When an infinitive follows a preposition (like de here) and its subject is exactly the same as the conjugated verb that governs it (sejas), you generally use the impersonal (uninflected) infinitive. Adding the personal ending here would be unnecessarily repetitive.
Does capaz always require the preposition de?
Yes, when the adjective capaz (capable or able) is followed by an action, it must be linked with the preposition de.
How is the word comestível (edible) formed?
It comes from the verb comer (to eat). Adding the suffix -ível (or -ável for AR verbs) to a verb root often translates to '-ible' or '-able' in English. Note the slight spelling shift from 'comer' to comestível (though comível also exists, comestível is the standard word for 'edible' when referring to safe-to-eat foods).
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