It is read:
くうきいれ を つかう
So the whole sentence is くうきいれをつかう.
を marks the direct object of the verb.
Here:
So 空気入れを使う means to use an air pump.
You can think of it as:
In this sentence:
使う is the plain dictionary form.
Japanese sentences are often shown in dictionary form when:
Compare:
Both are correct. The difference is mainly style and politeness, not core meaning.
Normally, Japanese is written without spaces:
空気入れを使う。
Spaces are often added in beginner materials to make the structure easier to see. They help learners notice:
So the spaced version is for learning convenience, not standard native writing.
Yes. 空気入れ is a general word for a device used to pump air into something.
Depending on context, it could mean a pump for:
However, in many everyday situations, people will often picture a bicycle pump first unless context suggests something else.
They are related, but they focus on different things.
So:
For example:
It is grammatically fine, but by itself it can feel a little like a short note, instruction, or action label rather than a full conversational sentence.
That is because Japanese often omits information that is understood from context, such as:
So in real context, it could naturally mean things like:
Japanese often relies heavily on context, so short sentences like this are very common.