La fiŝo estas freŝa.

Estas is the present-tense form of esti, which means to be. Esperanto verbs do not change depending on the subject, so:

• mi estas = I am
• vi estas = you are
• li estas = he is
• la fiŝo estas = the fish is

That makes Esperanto verb conjugation much simpler than English.

Because freŝa is describing the noun fiŝo. In Esperanto:

• -o = noun
• -a = adjective

So fiŝo is a thing, while freŝa is a quality of that thing.

Yes. Adjectives agree with the nouns they describe in number and case. In this sentence, fiŝo is singular and has no accusative -n, so the adjective is just freŝa.

For example:

• La fiŝo estas freŝa. = The fish is fresh.
• La fiŝoj estas freŝaj. = The fish are fresh.

Here both the noun and adjective become plural.

There is no -n because la fiŝo is the subject of the sentence, not a direct object. In La fiŝo estas freŝa, the fish is the thing being talked about.

Also, after estas, the adjective freŝa is a predicate adjective, so it does not take -n either.

A simple guide is FEE-sho.

• fi sounds like fee
• ŝ sounds like English sh
• o is a clear vowel, like o in a short, pure sound

Esperanto spelling is very regular, so words are usually pronounced exactly as written.

A simple guide is FRESH-ah.

• fre sounds like fresh without the final sh
• ŝ gives the sh sound
• a is like ah

The stress in Esperanto usually falls on the second-to-last syllable, so:

• FI-ŝo
• FRE-ŝa

It is singular. In Esperanto, plural nouns take -j, so:

• fiŝo = fish, one fish
• fiŝoj = fish, more than one fish

So La fiŝo estas freŝa refers to one fish.

Usually you would say La fiŝo estas freŝa if you mean the fish. Without la, Fiŝo estas freŝa sounds more general or less natural in many contexts, depending on what you want to say.

If you want a very general statement, Esperanto often prefers a different structure, such as talking about fish in general in another way. So in this sentence, la is the natural choice for a specific fish.

Yes, adjectives can come before or after the noun in Esperanto. So both of these are possible:

• la freŝa fiŝo = the fresh fish
• la fiŝo estas freŝa = the fish is fresh

But these mean slightly different things grammatically:

• la freŝa fiŝo: the adjective is inside the noun phrase
• la fiŝo estas freŝa: the adjective comes after estas and tells you a property of the fish

It is a simple sentence with:

• La fiŝo = subject
• estas = linking verb
• freŝa = predicate adjective

So the structure is basically:

subject + to be + adjective

This is one of the most basic and common sentence patterns in Esperanto.