Question 1

Why is the singular imperative рассчитай used with the plural pronoun мы?

Accepted Answer

This is a special conditional structure taught in this lesson. The singular imperative form can be used with any subject (including plural ones like мы or они) to replace an if-clause. It creates a hypothetical scenario, usually about the past, similar to the English inversion Had we not calculated... .

Question 2

How would this look if we used the standard если бы construction instead? Is there a difference in meaning?

Accepted Answer

The standard version is Если бы мы не рассчитали скорость вовремя.... The meaning is identical, but the imperative construction (Не рассчитай мы...) is more expressive and adds dramatic flair, often used in spoken storytelling or vivid writing.

Question 3

Why is the perfective verb рассчитай used here rather than the imperfective рассчитывай?

Accepted Answer

Even though it takes the form of a command, it functions as a past-tense conditional. We need the perfective aspect here because it refers to a specific, one-time action that hypothetically failed to complete (calculating the speed for this specific event).

Question 4

Why does the particle бы come right after спутник instead of attaching to the verb взорвался?

Accepted Answer

The conditional particle бы is highly mobile. While спутник взорвался бы is perfectly correct, бы often shifts toward the beginning of the clause, anchoring itself right after the subject or the first stressed word to establish the conditional mood as early as possible.

Не рассчитай мы скорость вовремя, спутник бы взорвался.

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