Es importante que la pieza haya encajado en la cerradura.

Questions & Answers about Es importante que la pieza haya encajado en la cerradura.

Why do we use haya encajado (subjunctive) here instead of ha encajado (indicative)?
The phrase Es importante que is an impersonal expression that states a subjective opinion or value judgment. In Spanish, these expressions trigger the subjunctive in the following clause. Since we are talking about a completed past action (it has fit), we use the present perfect subjunctive: the subjunctive form of haber (haya) plus the past participle (encajado).
What is the difference between saying que la pieza encaje and que la pieza haya encajado?
Es importante que la pieza encaje uses the present subjunctive and means It is important that the piece fits (happening right now or in the future). By using the present perfect subjunctive (haya encajado), you are emphasizing that the action is already finished: It is important that the piece has fit (looking back at an action that is already complete).
What is the infinitive of encajado, and how else can it be used?
The verb is encajar. While it literally means to fit or to slot into place (like a key in a lock or a puzzle piece), it is also commonly used to talk about fitting in socially (like fitting into a friend group) or two ideas making sense together.
The English translation says piece. Could I use the word pedazo instead of pieza here?
No, they have distinct meanings in Spanish! A pieza is a functional, manufactured part of a whole, like a machine part, a spare part, or a chess piece. A pedazo is a random chunk, slice, or broken-off fragment of something (like a piece of cake or a piece of broken glass). Because this is a part meant to fit into a lock, it has to be pieza.

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