Question 1

Why do we use такой here instead of так for "so"?

Accepted Answer

In Russian, "so" translates to такой when it modifies a noun or a full adjective (like бледный). It acts like an adjective itself, which is why it agrees with the masculine singular subject мальчик. You use так when modifying a verb, an adverb, or a short-form adjective (e.g., он бежал так быстро - he ran so fast).

Question 2

Is it mandatory to include что and the comma?

Accepted Answer

Yes! In English, you can often drop "that" (e.g., "The boy was so pale it left a terrible impression"). In Russian, you can never drop что in a такой... что (so/such... that) sentence. You must also always put a comma before it to separate the two clauses.

Question 3

Why does the verb оставило end in -о?

Accepted Answer

The verb оставило (left) is in the past tense, so it must agree in gender with its subject. The subject of the second half of the sentence is это ("it," referring to the whole situation of the boy being pale). Это is grammatically neuter, so the verb takes the neuter past-tense ending -о.

Question 4

What case is ужасное впечатление and why?

Accepted Answer

It is in the accusative case because it is the direct object receiving the action of the verb оставило (left). Because впечатление (impression) is a neuter inanimate noun, its accusative form looks exactly the same as its dictionary (nominative) form. The modifying adjective ужасное (terrible) also stays the same.

Мальчик был такой бледный, что это оставило ужасное впечатление.

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