kii wo sagete.

Because キー is a loanword from English key. In Japanese, loanwords are usually written in katakana.

In this sentence, キー often means a musical key or pitch level, especially in contexts like singing, karaoke, or music practice. Context matters, since キー can also mean other kinds of key in different situations.

を marks the direct object of the verb.

So in キーを下げて, キー is the thing being lowered, and 下げて is the action being done to it.

A very literal breakdown is:

• キー = key
• を = object marker
• 下げて = lower it / lower

So the structure is basically [object] + を + [verb].

下げて is the て-form of the verb 下げる, which means to lower or to bring down.

So:

• dictionary form: 下げる
• て-form: 下げて

The て-form has several uses in Japanese. Here, it is being used to make a request or instruction, something like lower it or please lower it, depending on tone and context.

Because 下げる and 下がる are different kinds of verbs.

• 下げる = transitive = to lower something
• 下がる = intransitive = to go down / to be lowered

In this sentence, someone is being told to lower the key, so Japanese uses the transitive verb 下げる.

Compare:

• キーを下げて = lower the key
• キーが下がっている = the key has gone down / is lowered

This transitive/intransitive pair is very common in Japanese, and it often causes confusion for learners.

Often, yes. The て-form by itself can sound like a casual request, so 下げて。 can mean something like:

• Lower it.
• Please lower it.

The exact tone depends a lot on context, relationship, and voice.

It is softer than a strong command like 下げろ, but it is still fairly direct. So it can sound natural among friends, coworkers, family, or in a casual situation, but not especially polite.

It is casual, not polite.

A more polite version would be:

• キーを下げてください。 = Please lower the key.
• キーを下げてもらえますか。 = Could you lower the key?

So キーを下げて。 is fine in informal speech, but you would usually not use it with someone you need to be respectful toward unless the situation is very casual.

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

In a sentence like キーを下げて。, the implied subject is usually you:

• (あなたが) キーを下げて。

But Japanese normally does not say あなた unless it is needed for emphasis or clarity. So the sentence just gives the action and leaves the listener to understand who should do it.

In very casual speech, particles are sometimes dropped, so you might hear キー下げて.

However, the standard and safer form is キーを下げて. For learners, it is best to keep を here.

So:

• standard: キーを下げて
• very casual speech: キー下げて

No. Normal Japanese writing usually does not use spaces between words.

So this would normally be written as:

キーを下げて。

The spaced version is often only used in textbooks or learning materials to make the sentence easier to read.

In modern Japanese, the particle を is usually pronounced o, not wo in normal speech.

So キーを下げて is pronounced roughly like:

kii o sagete

A few pronunciation notes:

• キー has a long vowel: kii
• を sounds like o
• 下げて is sagete

So even though the kana is を, you will usually hear it as o.