Учительница пишет на доске мелом, когда проектор не работает.

The teacher writes on the board with chalk when the projector doesn’t work.

Breakdown of Учительница пишет на доске мелом, когда проектор не работает.

• писать: to write
• на: on
• не: not
• когда: when
• работать: to work
• учительница: the teacher
• мел: the chalk
• доска: the board
• проектор: the projector

Questions & Answers about Учительница пишет на доске мелом, когда проектор не работает.

Why is it учительница and not учитель?

Учительница means female teacher, while учитель means male teacher or sometimes just teacher in a more general sense.

In this sentence, the speaker specifically chose the feminine noun учительница, so we know the teacher is a woman.

A few related points:

• учитель = male teacher
• учительница = female teacher

In modern usage, учительница is very common in everyday speech. A textbook or formal context might sometimes use учитель more generically, but here the sentence clearly refers to a woman.

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Why is the verb пишет and not something else like пишетcя or a past-tense form?

Пишет is the 3rd person singular present tense of писать = to write.

So:

• я пишу = I write / I am writing
• ты пишешь = you write
• он/она пишет = he/she writes / is writing

Since учительница is she, the verb is пишет.

Russian present tense does not distinguish as clearly as English between:

• she writes
• she is writing

So пишет can mean either, depending on context.

Also, писать is imperfective, which is the normal aspect used for present tense in Russian.

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Why is на доске and not на доску?

This is a very common Russian case question.

After на, Russian can use different cases depending on the meaning:

• на + accusative = motion onto something
• на + prepositional = location on something

Here, на доске means on the board, so it describes location, not movement.

Compare:

• Учительница пишет на доске. = The teacher writes on the board.
• Учительница вешает плакат на доску. = The teacher hangs a poster onto the board.

So:

• доска = board
• на доске = on the board

The form доске is prepositional singular.

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Why is мелом in that form?

Мелом is the instrumental case of мел = chalk.

The instrumental case is often used for the tool, means, or instrument used to do something.

So:

• писать мелом = to write with chalk
• писать ручкой = to write with a pen
• резать ножом = to cut with a knife

That is why the sentence uses:

• мел → dictionary form
• мелом → instrumental form

So мелом means with chalk.

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Why does не работает mean is not working for a projector?

In Russian, работать does not only mean to work in the sense of having a job. It also means to function / to operate for machines and devices.

So:

• проектор работает = the projector is working / functioning
• проектор не работает = the projector is not working

You can use работать this way for many things:

• Телефон не работает. = The phone isn’t working.
• Интернет не работает. = The internet isn’t working.
• Лифт не работает. = The elevator isn’t working.

This is very natural Russian.

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What exactly does когда mean here?

Когда usually means when, but depending on context it can also feel like whenever.

In this sentence:

Учительница пишет на доске мелом, когда проектор не работает.

the meaning is probably something like:

• The teacher writes on the board with chalk when the projector isn’t working
• or more naturally in many contexts:
• The teacher writes on the board with chalk whenever the projector isn’t working

Because both verbs are in the present tense, the sentence often sounds like a general habit or repeated situation, not just one single moment.

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Does this sentence mean a habit, or is it happening right now?

It can technically mean either, but the most natural reading is usually a habitual / repeated action.

Why?

Because Russian present tense often covers both:

• is writing
• writes

And with когда проектор не работает, it often sounds like a repeated classroom situation:

• Whenever the projector doesn’t work, the teacher writes on the board with chalk.

If you wanted to make it very clearly about right now, Russian would usually rely on context or add words like:

• сейчас = now
• в данный момент = at this moment

Without extra context, a native speaker will often hear this as a general truth or routine.

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Why is there a comma before когда?

Because когда проектор не работает is a subordinate clause.

Russian punctuation usually puts a comma before subordinate clauses introduced by words like:

• когда = when
• если = if
• потому что = because
• что = that

So the structure is:

• main clause: Учительница пишет на доске мелом
• subordinate clause: когда проектор не работает

That is why the comma is required:

Учительница пишет на доске мелом, когда проектор не работает.

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Is the word order fixed, or could it be changed?

Russian word order is more flexible than English word order.

The neutral order here is:

Учительница пишет на доске мелом, когда проектор не работает.

But Russian can move parts around for emphasis or style. For example:

• Когда проектор не работает, учительница пишет на доске мелом.
• Мелом учительница пишет на доске, когда проектор не работает.

These alternatives are grammatically possible, but they shift the focus slightly.

Very roughly:

• starting with Когда проектор не работает... emphasizes the condition first
• starting with Мелом... emphasizes the tool

So the original sentence is natural and neutral, but not the only possible order.

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Why is it на доске, not по доске or в доске?

Russian uses на with surfaces.

A board is understood as a surface you write on, so Russian says:

• на доске = on the board

Not:

• в доске = in the board
• по доске = along/across the board, which would mean something different

This is similar to:

• на стене = on the wall
• на столе = on the table
• на бумаге = on paper

So писать на доске is the standard expression.

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Why is there no word for the or a in the sentence?

Russian does not have articles like English a and the.

So:

• учительница can mean a teacher or the teacher
• проектор can mean a projector or the projector
• доска can mean a board or the board

The listener understands which one is meant from context.

In this sentence, English would probably translate it as:

• The teacher writes on the board with chalk when the projector isn’t working.

But Russian does not need separate words for the or a.

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What case is проектор, and why does it stay unchanged?

Проектор is in the nominative case, because it is the subject of the clause:

проектор не работает = the projector is not working

The nominative is the dictionary form, and for a masculine noun like проектор, the singular nominative is simply:

• проектор

So it stays unchanged because it is the subject of the verb работает.

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How would a Russian speaker likely pronounce this sentence, including stress?

A natural stressed version is:

учи́тельница пи́шет на доске́ ме́лом, когда́ прое́ктор не рабо́тает

Stress is important in Russian, because it is not always predictable.

A few notes:

• учи́тельница → stress on и
• пи́шет → stress on the first syllable
• доске́ → stress on the last syllable
• ме́лом → stress on ме
• когда́ → stress on the last syllable
• прое́ктор → stress on е
• рабо́тает → stress on бо

If a learner ignores stress, they may still be understood, but correct stress makes your Russian sound much more natural.

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Could I leave out мелом, or is it necessary?

Yes, you could leave it out.

• Учительница пишет на доске, когда проектор не работает.

This still means:

• The teacher writes on the board when the projector isn’t working.

Adding мелом simply makes the sentence more specific by saying with chalk.

Russian often leaves out details that are obvious from context, but including them is perfectly natural when you want to be explicit.

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Could I say учитель пишет instead, even if the teacher is a woman?

In some contexts, especially more formal or general ones, Russian may use a masculine profession noun more generically. But in normal everyday speech, if you know the teacher is a woman, учительница is the most natural choice.

So for this sentence:

• учительница пишет clearly means a female teacher is writing

If you say:

• учитель пишет

people will normally understand a male teacher is writing.

So if the person is female, учительница is the safer and more natural form here.