mado o sukoshi akereba, soto no kaze o heya ni irerareru.

direct object particle

Breakdown of mado o sukoshi akereba, soto no kaze o heya ni irerareru.

• の: possessive case particle
• 部屋へや: room
• に: location particle

Questions & Answers about mado o sukoshi akereba, soto no kaze o heya ni irerareru.

Why is the first verb 開ければ? What does -ば mean here?

開ければ is the conditional form of 開ける.

So:

• 開ける = to open something
• 開ければ = if you open / when you open

In this sentence, -ば gives the idea if you do X, then Y becomes possible.

So the structure is:

• 窓を少し開ければ = if you open the window a little
• 外の風を部屋に入れられる = you can let the outside air into the room

Compared with other conditionals:

• -たら is often more conversational and event-based
• -と often sounds more automatic
• -ば often sounds like a general condition or a natural consequence

Here, -ば fits nicely because it sounds like opening the window a little is enough to make the next thing possible.

What is the difference between 開ける and 開く?

This is a very common question because English uses open for both.

In Japanese:

• 開ける = to open something → transitive
• 開く = to open / be open → intransitive

So:

• 窓を開ける = to open the window
• 窓が開く = the window opens / is open

In your sentence, a person is actively opening the window, so 開ける is the correct verb.

Why is 窓 marked with を?