deoumyeon seonpunggireul teureoyo.

-면 is a conditional ending. It means if or when, depending on context.

So 더우면 means if it is hot or when it is hot.

In this sentence, it sets up the condition first:

• 더우면 = if/when it’s hot
• 선풍기를 틀어요 = turn on the fan

This comes from the dictionary form 덥다, meaning to be hot.

덥다 is a ㅂ-irregular adjective. When an ending beginning with a vowel is added, the ㅂ changes to 우.

So:

• 덥다 → stem 덥-
• 덥 + -면
• ㅂ changes to 우
• 더우면

This same pattern appears in other words too:

• 춥다 → 추우면
• 어렵다 → 어려우면

So 더우면 is the correct irregular form.

It can mean both.

Korean -면 often covers both ideas:

• if it’s hot = a possible condition
• when it’s hot = something that happens whenever that condition occurs

So this sentence could mean:

• a general habit: When it’s hot, I turn on the fan
• a situational plan: If it’s hot, I’ll turn on the fan

The exact nuance depends on context.

Korean very often leaves out the subject when it is obvious from context.

So 더우면 선풍기를 틀어요 does not explicitly say who turns on the fan. Depending on the situation, it could mean:

• I turn on the fan
• we turn on the fan
• you should turn on the fan
• people turn on the fan

Likewise, in 더우면, Korean does not need to say it is hot with a separate subject like English often does.

This omission is very normal and natural in Korean.

를 is the object marker.

In this sentence, 선풍기 is the thing being turned on, so it is the direct object of 틀어요.

• 선풍기 = fan
• 선풍기를 = the fan, as the object

So:

• 선풍기를 틀어요 = turn on the fan

This is standard grammar.

Yes, in everyday speech, Korean often drops object particles like 을/를 when the meaning is still clear.

So both are possible:

• 선풍기를 틀어요 = more complete / textbook-style / clear
• 선풍기 틀어요 = common in casual conversation

However, for learners, it is good to understand and practice the full version first.

선풍기 means an electric fan.

It usually refers to the appliance that blows air in a room.

A few useful comparisons:

• 선풍기 = electric fan
• 부채 = handheld fan
• 팬 = fan, but usually used in loanword contexts, not the basic everyday word for the appliance

So in this sentence, 선풍기 definitely means the machine.

In Korean, 틀다 is commonly used for starting or turning on things that run, play, or operate, especially things like:

• 선풍기 = fan
• 에어컨 = air conditioner
• 라디오 = radio
• 음악 = music
• TV in many contexts

So 선풍기를 틀어요 is a very natural way to say turn on the fan.

This is one of those places where Korean uses a verb that does not match English word-for-word, so it is best to learn it as a natural expression.

Sometimes yes, and many Korean speakers will understand it, because 켜다 also means to turn on.

But 선풍기 very naturally goes with 틀다, so 선풍기를 틀어요 sounds especially idiomatic.

A simple way to think about it:

• 켜다 = general turn on
• 틀다 = often used for devices that run/play/blow

For a learner, 선풍기를 틀어요 is an excellent and natural phrase to remember.

틀어요 is in the 해요체 style, the everyday polite form.

That means it is:

• polite
• natural in daily conversation
• appropriate in many normal situations

Related forms:

• 틀어 = casual, non-polite
• 틀어요 = polite everyday style
• 틉니다 = formal polite style

So this sentence is polite but not stiff.

It can be either.

Because Korean often uses the present form in these situations, 틀어요 can express:

1. A general habit

   • When it’s hot, I turn on the fan

2. A future action under a condition

   • If it’s hot, I’ll turn on the fan

Korean does not always need a separate future form where English might use will. Context usually tells you whether it is habitual or future.

It comes from the dictionary form 틀다.

Step by step:

• dictionary form: 틀다
• stem: 틀-
• add polite ending -어요
• result: 틀어요

So:

• 틀다 = to turn on / run / play
• 틀어요 = turn on / I turn on / turns on, in polite style

Korean verb endings carry information like politeness and sentence type, rather than changing for subjects like I, you, or he/she.

Yes, it is completely natural.

It is a simple, everyday-style sentence that sounds like something a Korean speaker could really say.

It is also useful because it shows several important Korean patterns at once:

• ㅂ-irregular adjective: 덥다 → 더우면
• conditional ending: -면
• object marking: 선풍기를
• natural verb choice: 틀어요

So it is a very good sentence to study.