Learn Hardcore Japanese: neko ha soto ni imasu.

The particle は marks 猫 as the topic of the sentence. It tells us that “as for the cat,” the information that follows (it’s outside) applies to it. In English we don’t have a direct topic marker, so we often translate it just as “The cat is outside,” but in Japanese you’re literally saying “As for the cat, (it) is outside.”

Why is the verb います used here instead of あります?

Japanese has two existence verbs: います for animate beings (people, animals) and あります for inanimate objects (books, chairs, cities). Since 猫 (cat) is alive, you use います to say it exists or is located somewhere.

Why do we use the particle に after 外 in 外に?

With location verbs like いる／あります, the particle に marks the place where something or someone exists. So 外にいます means “exists in the outside.” You’re pointing out the static location of the cat.

Could we use で instead of に here, as in 猫は外でいます?

No. The particle で marks where an action takes place (e.g. 外で遊ぶ – “play outside”). Existence verbs need に to indicate location. 外でいます would sound like you’re trying to perform an action of being outside, which isn’t grammatical.

Can we replace は with が in this sentence?

Yes, you could say 猫が外にいます, but the nuance changes. が introduces new or focal information – “There is a cat outside.” は treats “the cat” as already known or contrasted with something else – “As for the cat, it is outside.”

Is the word order strict? Could we say 外に猫はいます?

Japanese word order is relatively flexible, but the default topic-first structure is 猫は外にいます. If you say 外に猫はいます, you’re front-loading the location for emphasis or contrast, like “As for outside, the cat is there.”

Can we omit the particle は entirely and just say 猫外にいます?

No. Japanese particles are essential for showing the grammatical role of each word. Dropping は would leave 猫 floating without a marker. You could switch to 猫が外にいます, but you still need a particle to connect 猫 to the rest of the sentence.