heya ni buranketto wo oku.

Literally, it is something like:

room + in/into + blanket + object marker + put/place

So the sentence means to put/place a blanket in the room.

Because 置く is in dictionary form, this can sound like:

• put a blanket in the room
• to put a blanket in the room
• a plain non-past statement such as I put / will put a blanket in the room, depending on context

In this sentence, に marks the destination or location where something is placed.

So:

• 部屋に = in the room / into the room

With verbs like 置く, に often marks the place where the object ends up.

Examples:

• 机に本を置く = put a book on the desk
• 箱におもちゃを入れる = put toys in the box

Here, 部屋に tells you the location where the blanket is being placed.

This is a very common question.

• に marks the place something goes to or is placed in/on.
• で marks the place where an action happens.

With 置く, the important idea is the result: the blanket ends up in the room. That is why に is natural.

Compare:

• 部屋にブランケットを置く = put a blanket in the room
• 部屋でブランケットを使う = use a blanket in the room

In the second sentence, 使う is just an action happening in the room, so で is used.

を marks the direct object of the verb.

Here, the thing being placed is ブランケット, so:

• ブランケットを = the blanket as the thing being put somewhere

In other words, を tells you what the verb 置く is acting on.

Examples:

• 本を読む = read a book
• ドアを開ける = open the door
• ブランケットを置く = put/place a blanket

Because ブランケット is a loanword from English blanket.

Katakana is commonly used for:

• foreign loanwords
• foreign names
• some onomatopoeia
• emphasis in some cases

So ブランケット is the normal way to write blanket in Japanese.

You may also hear 毛布（もうふ）, which is a native Japanese word meaning blanket. The nuance can differ a little depending on the kind of blanket and the speaker’s choice of vocabulary.

置く（おく） means to put, to place, or to set down.

It is used when you place something somewhere.

Examples:

• 机にコップを置く = put a cup on the desk
• 床にかばんを置く = put a bag on the floor

It often suggests physically placing something and leaving it there.

Depending on context, English translations can include:

• put
• place
• set down
• sometimes leave

Japanese basic sentence order is often described as subject-object-verb, and the verb usually comes at the end.

So in this sentence:

• 部屋に = location
• ブランケットを = object
• 置く = verb

That is very normal Japanese word order.

English usually puts the verb earlier:

• Put a blanket in the room

Japanese saves the main action until the end.

Yes. Japanese often omits the subject when it is understood from context.

So 部屋にブランケットを置く can mean things like:

• I put a blanket in the room
• I will put a blanket in the room
• Put a blanket in the room
• to put a blanket in the room

The exact interpretation depends on context.

Japanese leaves out information that is obvious to the listener much more often than English does.

Japanese dictionary form like 置く does not work exactly like the English present tense.

It can express:

• a habitual action
• a future action
• a plain statement
• a dictionary-style or neutral form

So depending on context, it might mean:

• I put a blanket in the room
• I will put a blanket in the room
• to put a blanket in the room

Japanese relies heavily on context for time.

Yes, Japanese word order is more flexible than English, as long as the particles stay correct.

For example, these can all be grammatical:

• 部屋にブランケットを置く
• ブランケットを部屋に置く

Both mean essentially the same thing.

However, some orders sound more natural than others depending on emphasis and context. The particles に and を are what show the grammatical roles, so they are very important.

It can feel like either one in English, depending on context.

With 置く, に marks the location where the blanket is placed. So the natural English translation is usually:

• in the room

But the idea of movement toward that location is also there, so in some contexts English might feel closer to:

• into the room

Japanese does not always separate in and into the same way English does.

Yes, a little.

• 毛布（もうふ） is the standard Japanese word for a blanket, especially a warm blanket used on a bed.
• ブランケット is a loanword and can sound more modern, product-like, or refer to certain kinds of blankets, such as throws, lap blankets, or branded items.

In many situations, they may overlap, but 毛布 is often the safer basic vocabulary word to learn first.

The readings are:

• 部屋 = へや
• 置く = おく

So the full sentence is read:

へや に ブランケット を おく

A natural pronunciation would sound like:

heya ni buranketto o oku

Also, although を is written wo in romanization systems, in modern Japanese it is pronounced basically like o.