sougankyou wo tukau.

It is read そうがんきょう.

• 双 = pair
• 眼 = eye
• 鏡 = optical instrument / mirror / lens-related object

So 双眼鏡 is the normal Japanese word for binoculars.

を marks the direct object of the verb.

In 双眼鏡を使う, the thing being used is 双眼鏡, so it takes を.

• 双眼鏡 = binoculars
• を = marks what the verb acts on
• 使う = to use

A good way to think about it is:

• What am I using?
• Binoculars
• Therefore: 双眼鏡を使う

Also, although it is written を, the particle is pronounced お in modern Japanese.

Because with 使う, the thing you use is usually the direct object, so it takes を.

• 双眼鏡を使う = to use binoculars

The particle で is often used to mark a tool or means when you do some other action.

For example:

• 双眼鏡で鳥を見る = to look at birds with binoculars

Here, the main verb is 見る. The binoculars are the tool used for seeing, so で is natural.

So the difference is:

• 双眼鏡を使う = the action itself is using binoculars
• 双眼鏡で見る = the main action is seeing, and binoculars are the tool

使う is the dictionary form of the verb. It is also called the plain form.

This form can mean different things depending on context, such as:

• a general statement
• a habitual action
• a future action

So 双眼鏡を使う could mean things like:

• I use binoculars
• I will use binoculars
• We use binoculars

If you want the polite form, it becomes:

• 双眼鏡を使います

Yes, from an English point of view, it may feel incomplete, but in Japanese this is very normal.

Japanese often leaves out information that is understood from context, especially:

• the subject
• the object
• sometimes even other parts of the sentence

So 双眼鏡を使う does not explicitly say who uses the binoculars. Depending on context, it could mean:

• I use binoculars
• You use binoculars
• He uses binoculars
• They will use binoculars

Context tells you who the subject is.

It means binoculars, usually understood as one pair of binoculars.

Japanese nouns usually do not change form for singular and plural the way English nouns do. So the same word can refer to one item or more than one, depending on context.

Also, Japanese does not use articles like a, an, or the.

So 双眼鏡を使う does not directly say:

• use a pair of binoculars
• use the binoculars
• use binoculars

Context decides that.

Because Japanese is basically a verb-final language.

A very common sentence pattern is:

• object + を + verb

So:

• 双眼鏡 = binoculars
• を = object marker
• 使う = use

That gives:

• 双眼鏡を使う

This is normal Japanese word order. In English, the verb usually comes earlier, but in Japanese the main verb usually comes at the end of the sentence.

Yes. 使う is the plain form, so the sentence sounds neutral/casual.

If you want to be polite, you would say:

• 双眼鏡を使います。

Very roughly:

• 双眼鏡を使う。 = plain / casual
• 双眼鏡を使います。 = polite

The basic meaning is the same.

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

It would normally be written as:

• 双眼鏡を使う。

Spaces are often added in beginner materials to make the sentence easier to read and to show word boundaries clearly. They are a learning aid, not standard spelling.