Мама сказала, что из‑за старой проводки может появиться искра.

In Russian, subjects are often omitted when they are clear from context, but in this sentence Мама is named explicitly because she is the person doing the speaking.

Russian also often uses family words like мама, папа, бабушка almost like names in everyday speech. So Мама сказала sounds very natural and means Mom said...

You could say Она сказала, but that would mean She said, and it would only work if it were already obvious that she = Mom.

Сказать and говорить can both relate to speaking, but they are used differently.

• сказать = to say, to tell, to state something once, as a completed act
• говорить = to speak, to talk, or to say in a more ongoing/repeated sense

Here, Мама сказала, что... means Mom said that... as one completed statement, so сказала is the natural choice.

Also, сказала is the past tense feminine singular form, because мама is grammatically feminine.

Russian normally uses a comma before что when it introduces a subordinate clause.

So the sentence is divided into:

• Мама сказала = main clause
• что из‑за старой проводки может появиться искра = subordinate clause

This is very standard in Russian:

• Я знаю, что он дома.
• Она сказала, что придёт позже.

So the comma here is required.

Here что means that and introduces reported speech or reported information.

So:

• Мама сказала, что... = Mom said that...

This is one of the most common uses of что in Russian.

Be careful: что can also mean what, depending on the sentence. But in this structure after verbs like сказать, знать, думать, видеть, it very often means that.

Из‑за requires the genitive case, so проводка changes to проводки.

The dictionary form is:

• проводка = wiring

After из‑за, we get:

• из‑за проводки = because of the wiring

And because старая must agree with проводка, it also changes into the genitive feminine singular:

• старая проводка
• из‑за старой проводки

So:

• старой = genitive feminine singular
• проводки = genitive feminine singular

Here из‑за means because of.

So:

• из‑за старой проводки = because of the old wiring

This preposition can also literally mean from behind, depending on context:

• из‑за дома = from behind the house

But in your sentence it clearly has the causal meaning because of.

Also note the spelling: из‑за is normally written with a hyphen.

Может появиться means may appear / can appear / might appear.

• может = may, can, might
• появиться = to appear

This combination expresses possibility, not certainty.

Compare:

• может появиться искра = a spark may appear
• появится искра = a spark will appear / a spark appears

So the sentence is not saying the spark definitely will happen, only that it is possible because of the old wiring.

Because it follows может.

In Russian, modal words and verbs such as:

• мочь = can, to be able
• нужно = necessary
• надо = need to
• нельзя = must not / cannot

are typically followed by an infinitive.

So:

• может появиться = may appear
• может случиться = may happen
• может начаться = may begin

That is why появиться stays in the infinitive.

This is an aspect question.

• появиться = perfective
• появляться = imperfective

The perfective verb появиться refers to a single completed event: a spark may appear.

That fits this sentence well, because we are talking about the possibility of one event happening.

If you used появляться, it would suggest repeated or habitual appearance:

• Из‑за старой проводки могут появляться искры.
  = Because of the old wiring, sparks may appear / may keep appearing.

So in the original sentence, появиться is used because it refers to one possible occurrence.

Because искра is the subject of появиться.

In Russian, the thing that appears is in the nominative case:

• появилась искра = a spark appeared
• может появиться искра = a spark may appear

You would use искру only if it were a direct object in a different construction, for example:

• Я увидел искру. = I saw a spark.

But here the spark is not an object being acted on. It is the thing that comes into existence or becomes visible.

Not quite.

• провод = a wire
• проводка = wiring, electrical wiring, the system of wires in a building or wall

So старая проводка means old wiring, not just an old wire.

This is why the sentence sounds natural in a household/electrical safety context: old wiring may cause a spark.

Yes. Russian word order is flexible, though different orders change the emphasis.

The original:

• Мама сказала, что из‑за старой проводки может появиться искра.

This is neutral and natural.

Other possible orders inside the subordinate clause include:

• Мама сказала, что искра может появиться из‑за старой проводки.
• Мама сказала, что может появиться искра из‑за старой проводки.

These are grammatically possible, but the emphasis shifts:

• putting искра earlier can highlight the spark
• keeping из‑за старой проводки early can highlight the cause

The original sentence is a very natural, balanced version.

In many cases, мочь covers both ideas that English separates into can and may/might.

So может появиться can be translated as:

• can appear
• may appear
• might appear

The best English choice depends on context.

In this sentence, since the idea is about a possible dangerous consequence of old wiring, may appear or might appear is often the best fit, because it sounds like a warning about possibility.

Not necessarily. The singular here often refers to the possibility of a spark in a general sense.

Russian, like English, can use a singular noun to describe a possible event:

• может появиться искра = a spark may appear

If the speaker wanted to emphasize repeated or multiple sparks, they might say:

• могут появиться искры = sparks may appear

So the singular in the original sentence is perfectly natural and does not have to mean exactly one spark in a strict literal sense.