Questions & Answers about Vorrei che tu mostrassi il tuo talento senza timidezza.
Why is the verb mostrassi in the subjunctive mood, not the indicative?
In Italian, when expressing a desire or wish about someone else, you must use the subjunctive after verbs like volere (to want). Here vorrei (I would like) triggers the subjunctive in the subordinate clause. Using the indicative (e.g. mostri) would be grammatically incorrect after vorrei che.
Why is the subjunctive in the imperfect tense (mostrassi) rather than the present subjunctive (mostri)?
Italian follows a sequence-of-tenses rule. Vorrei is present conditional, so the subordinate clause takes the imperfect subjunctive (mostrassi). If you used a present-tense main verb like desidero, then you would pair it with the present subjunctive (desidero che tu mostri).
Why is there a che between vorrei and tu mostrassi?
Che is the conjunction that introduces subordinate clauses after expressions of wanting, hoping, fearing, etc. It links the main clause (vorrei) to the clause describing what you want someone to do (tu mostrassi il tuo talento).