Question 1

Why is the infinitive ответить used after прежде чем?

Accepted Answer

Because the logical subject of both actions is the same person (тебе). When the same person performs both actions, Russian uses the infinitive after прежде чем, translating smoothly to 'before answering'. If a different person were to answer, you would use a conjugated verb instead: прежде чем он ответит (before he answers).

Question 2

What is the difference between обдумать and simply using подумать or думать?

Accepted Answer

Думать (imperfective) is the general process of thinking. Подумать (perfective) means to think for a little while. Обдумать (perfective) specifically means 'to think over' or 'to consider thoroughly.' The prefix об- often implies covering a subject completely, which is exactly the result needed before giving an answer.

Question 3

Could I use перед тем как or до того как instead of прежде чем in this sentence?

Accepted Answer

Yes, they are grammatically interchangeable here and also take the infinitive. However, прежде чем sounds slightly more cautionary. It strongly implies that thinking it over is a necessary prerequisite to answering, whereas до того как simply states the chronological order of two events.

Question 4

Where should the comma go when using прежде чем?

Accepted Answer

The standard punctuation rule is to place the comma immediately before the word прежде, treating прежде чем as a single, undivided conjunction. While you might occasionally see native speakers split it (прежде, чем) to strongly emphasize the first word, keeping them together is the safest and most common choice.

Тебе нужно обдумать этот план, прежде чем ответить.

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