In einer Sekunde wird das Dokument fertig sein.

In one second the document will be finished.

Breakdown of In einer Sekunde wird das Dokument fertig sein.

• sein: to be
• in: in
• werden: to become
• das Dokument: the document
• die Sekunde: the second
• fertig: finished

Questions & Answers about In einer Sekunde wird das Dokument fertig sein.

Why do we say in einer Sekunde? What case is required after in here, and could we use a different preposition to express this?

in as a temporal preposition always takes the dative case when it indicates “after a certain amount of time.” That’s why eine becomes einer.

• innerhalb einer Sekunde means “within one second” (emphasizing a maximum duration).
• für eine Sekunde would mean “for one second” (indicating how long something lasts), so it changes the meaning.

Why is the verb wird used here? Isn’t the present tense possible in German for future events?

German can form the future with werden + infinitive to show that something will happen later. However, when the time reference is clear, the present tense often replaces the future. Both are fine:

• In einer Sekunde wird das Dokument fertig sein. (explicit future)
• In einer Sekunde ist das Dokument fertig. (present used for future)

What’s the difference between fertig sein and fertig werden? Could we say wird das Dokument fertig werden?

• fertig sein describes a state: “to be finished/to be ready.”
• fertig werden describes the process: “to become finished.”
  You can say In einer Sekunde wird das Dokument fertig werden, but native speakers usually prefer fertig sein to state that something will then be in a ready state.

I notice the word order: In einer Sekunde at the beginning and then wird. Is that standard German?

Yes. German follows the V2 rule (verb-second). If you start with a time adverbial (In einer Sekunde), that counts as the first element. The finite verb (wird) must come second, so the subject (das Dokument) follows.

Could I start with Das Dokument instead?

Absolutely. Then you get:
Das Dokument wird in einer Sekunde fertig sein.
Here Das Dokument is the first element, wird stays in second position, and in einer Sekunde moves after the verb and subject.

Why is Sekunde singular? What if it takes two seconds?

When you specify exactly one unit, use the singular: in einer Sekunde = “in one second.” For two or more units, use the plural without an article: in zwei Sekunden.