اگر دیوار را آبی کنی، اتاق روشن تر میشود.

اگر means if.

It introduces the condition:

• اگر دیوار را آبی کنی = if you paint/make the wall blue

Then the second clause gives the result:

• اتاق روشن‌تر می‌شود = the room becomes brighter / will get brighter

So the basic pattern is:

• اگر ... ، ...
• if ... , ...

را marks a specific direct object.

Here, دیوار را means the wall as the thing being affected by the action.

So:

• دیوار = wall
• دیوار را = the wall (as the direct object)

In this sentence, the action is being done to the wall, so را is used.

A native English speaker often expects something like a preposition here, but را is not exactly like to or for. It is an object marker.

Yes, آبی means blue, but in this sentence it functions like a resulting description:

• دیوار را آبی کنی = make/paint the wall blue

Persian often uses this pattern:

• [object] + را + [adjective/color] + کردن

For example:

• در را باز کرد = He opened the door
  literally: He made the door open
• دیوار را آبی کنی = You make the wall blue

So آبی is not standing alone; it tells us the result of the action.

کنی is the present subjunctive form of کردن (to do / to make).

After اگر, Persian very often uses the subjunctive when talking about a possible future condition:

• اگر ... کنی = if you do / if you make

So in this sentence:

• اگر دیوار را آبی کنی
  = if you paint/make the wall blue

This is more natural here than می‌کنی.

A helpful way to think about it:

• کنی here sounds like a condition or possibility
• می‌کنی would sound more like a regular present action: you do

کنی is second person singular:

• کنم = I do
• کنی = you do
• کند = he/she/it does

So کنی means you do / you make.

In this sentence, the subject you is not written because Persian often leaves subject pronouns out when the verb ending already makes the subject clear.

Because Persian commonly drops subject pronouns when they are understood from the verb.

So:

• کنی already tells you the subject is you (singular)

That means Persian does not need to say تو unless it wants emphasis or contrast.

So:

• اگر دیوار را آبی کنی = If you paint the wall blue

not because you is missing, but because it is already built into the verb ending.

روشن means bright / light.

Adding تر makes it comparative:

• روشن = bright
• روشن‌تر = brighter

So:

• اتاق روشن‌تر می‌شود = the room becomes brighter

The suffix تر works a lot like English -er.

Other examples:

• بزرگ = big

• بزرگ‌تر = bigger

• سریع = fast
• سریع‌تر = faster

Both spellings may be seen, but the more standard modern spelling is:

• روشن‌تر

with a half-space (technically a zero-width non-joiner).

Many texts, messages, or keyboards may write it as:

• روشن تر

The meaning is the same. This sentence uses the spaced version, but learners should recognize both.

The same thing happens with:

• می‌شود / میشود

Both are seen, though می‌شود is usually preferred in standard writing.

Here it means becomes.

It comes from شدن, which often means to become.

So:

• اتاق روشن‌تر می‌شود = the room becomes brighter

This is not a passive meaning like is made here.

A very common learner confusion is that شدن can have several uses, but in this sentence the natural meaning is clearly become.

Because اتاق is the subject of the second clause, not the direct object.

In:

• اتاق روشن‌تر می‌شود

the room is the thing that undergoes the change; it is the subject of becomes.

Only direct objects take را, so there is no را after اتاق.

Compare:

• دیوار را آبی کنی → the wall is the direct object
• اتاق روشن‌تر می‌شود → the room is the subject

Yes, it is a normal and understandable pattern.

Literally, it is closer to make blue, but in context it often corresponds to English paint ... blue.

So:

• دیوار را آبی کردن = to paint the wall blue / to make the wall blue

If the context is decorating or walls, English would usually translate it as paint the wall blue, even though Persian is structurally saying make the wall blue.

Very roughly:

• اگر = if
• دیوار را = the wall
• آبی = blue
• کنی = you make
• اتاق = room
• روشن‌تر = brighter
• می‌شود = becomes

So the literal structure is something like:

• If the wall blue you-make, the room brighter becomes.

That sounds unnatural in English, but it shows the Persian structure well.

Because Persian is generally a verb-final language.

That means the main verb often comes at the end of the clause.

So:

• دیوار را آبی کنی
• اتاق روشن‌تر می‌شود

Both end with the verb.

This is very normal in Persian and one of the biggest word-order differences from English.

Yes. That is a very natural translation.

Persian present forms in sentences like this often cover what English expresses with will.

So these are all reasonable translations:

• If you paint the wall blue, the room becomes brighter.
• If you paint the wall blue, the room will become brighter.
• If you make the wall blue, the room will get brighter.

English chooses among these based on style, but the Persian sentence naturally allows that future-result meaning.

Then کنی would become کنید.

So:

• اگر دیوار را آبی کنید، اتاق روشن‌تر می‌شود.

That can mean:

• if you all paint the wall blue
• if you paint the wall blue (polite singular)

So the only change is the verb ending.

A careful pronunciation would be approximately:

• agar divâr râ âbi koni, otâq rowshan-tar mishavad

In everyday speech, many speakers would say something closer to:

• agar divâr-o âbi koni, otâq rowshan-tar mishe

A few useful notes:

• را often sounds like ro or -o in speech
• می‌شود is often pronounced میشه
• روشن‌تر may sound like rowshan-tar

So the written and spoken forms can differ a bit.

Grammatically, دیوار را آبی می‌کنی means you make/paint the wall blue as a present statement or question, not as the same type of conditional form used here.

Compare:

• اگر دیوار را آبی کنی... = if you paint the wall blue...
• دیوار را آبی می‌کنی. = you paint the wall blue
• دیوار را آبی می‌کنی؟ = are you painting the wall blue? / do you paint the wall blue?

So for this conditional sentence, کنی is the right choice.

Yes, it is natural and correct.

In more formal writing, you might see:

• می‌شود instead of میشود
• روشن‌تر instead of روشن تر

In everyday speech, you might hear:

• اگه instead of اگر
• میشه instead of می‌شود

So the sentence is standard and natural, with only minor spelling/pronunciation variations depending on style.