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Quien habrá patentado la máquina para mañana será el abogado.

Quien habrá patentado la máquina para mañana será el abogado.
The one who will have patented the machine by tomorrow will be the lawyer.
From Lesson 415:Emphasizing the subject (el que, quien)·Spanish (Latin America)

Questions & Answers about Quien habrá patentado la máquina para mañana será el abogado.

Why does this sentence start with Quien instead of El que?
In this subject-focus structure, you can use either quien or el que to mean "the one who" when referring to a person. Because the emphasized subject (el abogado) is a person, quien sounds very natural. If the sentence were emphasizing a specific object, you would be forced to use el que or la que.
Why do we use the future perfect (habrá patentado) here instead of just the future tense (patentará)?
We use the future perfect because the action of patenting will be fully completed before a specific deadline in the future. The phrase para mañana (by tomorrow) establishes that deadline, so habrá patentado (will have patented) emphasizes that the process will already be finished by that time.
Why is it para mañana and not por mañana?
When talking about deadlines or a specific point in time by which an action must be completed, you always use para. In this context, para translates perfectly to "by" in the English phrase "by tomorrow."
Why is the linking verb será in the future tense instead of the present tense es?
In Spanish pseudo-cleft sentences, the tense of the verb ser usually matches the timeframe of the main action. Since the entire context of the sentence is set in the future, the linking verb is also in the future (será). Using the present tense es is sometimes heard in casual speech, but matching the tenses is the correct standard structure.

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