Когда солнце светит слишком ярко, я закрываю жалюзи.

Когда means when and introduces a time clause.

In this sentence:

• Когда солнце светит слишком ярко = When the sun shines too brightly
• я закрываю жалюзи = I close the blinds

So the whole sentence has two parts:

1. a subordinate time clause
2. a main clause

Russian often uses когда exactly the way English uses when in sentences like When X happens, I do Y.

Because the first part, Когда солнце светит слишком ярко, is a subordinate clause introduced by когда.

Russian punctuation is stricter than English here: when a subordinate clause is attached to a main clause, it is normally separated by a comma.

So:

• Когда солнце светит слишком ярко, я закрываю жалюзи.

Even if English might sometimes feel less strict with commas, Russian requires it in this structure.

Солнце is the subject of the clause, so it is in the nominative case.

Here:

• солнце = the sun
• it is the thing doing the action
• the action is светит = shines

So the basic structure is:

• солнце светит = the sun shines

Because it is the subject, nominative is the expected form.

Светит is the 3rd person singular present tense of светить.

That matches солнце, which is:

• singular
• 3rd person
• neuter noun

So:

• я свечу or я светлю? not used this way for shine here
• он/она/оно светит
• солнце светит

In this sentence, светит means shines or is shining.

Because ярко is an adverb, and it modifies the verb светит.

The sentence is not saying:

• the bright sun

It is saying:

• the sun shines brightly

Compare:

• яркое солнце = a bright sun → adjective modifying a noun
• солнце светит ярко = the sun shines brightly → adverb modifying a verb

So ярко is correct because it describes how the sun shines.

Слишком means too or too much, not just very.

So:

• ярко = brightly
• слишком ярко = too brightly / too bright

This suggests excess: the sunlight is brighter than is comfortable or desirable.

Compare:

• очень ярко = very brightly
• слишком ярко = too brightly

That difference is important.

Закрываю is the imperfective verb form, and it fits a habitual/repeated meaning.

The sentence means something like:

• Whenever the sun shines too brightly, I close the blinds.

That is a repeated or usual action, so Russian normally uses the imperfective:

• закрывать → закрываю

If you said я закрою, that would be perfective future, meaning a single completed action in the future:

• Когда солнце будет светить слишком ярко, я закрою жалюзи.
• When the sun shines too brightly, I will close the blinds.

So:

• закрываю = habitual / repeated / general
• закрою = one future completed action

Mostly it sounds like a general habit or usual reaction.

• Когда солнце светит слишком ярко, я закрываю жалюзи.
• When the sun shines too brightly, I close the blinds.

This is a common Russian pattern: present tense + present tense to describe what usually happens.

Depending on context, present tense in Russian can sometimes describe something happening right now, but this sentence most naturally sounds habitual.

Normally, a direct object after a verb like закрываю would be in the accusative case. But жалюзи is a special noun.

Жалюзи is:

• indeclinable: its form does not change
• usually treated as plural-only

So the same form appears in different case roles:

• жалюзи as subject
• жалюзи as object

That is why you do not see a visible ending change here.

A useful thing to remember is the stress:

• жалюзИ

Yes, often you could.

Russian frequently omits subject pronouns when they are clear from the verb form.

So both are possible:

• Когда солнце светит слишком ярко, я закрываю жалюзи.
• Когда солнце светит слишком ярко, закрываю жалюзи.

The second version still clearly means I close the blinds, because закрываю is first person singular.

However, keeping я can sound more explicit, contrastive, or simply clearer for learners.

Yes, the order can be changed.

You can say:

• Когда солнце светит слишком ярко, я закрываю жалюзи.
• Я закрываю жалюзи, когда солнце светит слишком ярко.

Both are grammatical.

The difference is mainly in emphasis:

• starting with Когда... highlights the condition or situation first
• starting with Я закрываю жалюзи... highlights the action first

Russian word order is fairly flexible, but the neutral version given is very natural.

Yes, it is a very natural expression.

• закрывать / закрыть = to close
• жалюзи = blinds

So:

• закрывать жалюзи = to close the blinds
• открывать жалюзи = to open the blinds

A learner should also know that Russian has related words for window coverings:

• шторы = curtains
• занавески = curtains/net curtains
• жалюзи = blinds

So the vocabulary choice here is normal and specific.

A rough pronunciation guide:

• Когда → kag-DA
• солнце → SOLN-tse
• светит → SVE-tyit
• слишком → SLISH-kam
• ярко → YAR-ka
• я → ya
• закрываю → za-KRY-va-yu
• жалюзи → zha-lyu-ZEE

A natural stress pattern would be:

Когда́ со́лнце све́тит сли́шком я́рко, я закрыва́ю жалюзи́.

For learners, the two stress points most worth memorizing are:

• закрыва́ю
• жалюзи́