Oliva fracida in qualo est.

Because qualo is in the ablative singular.

The noun is qualus = basket. After in, Latin uses:

• ablative for location: in the basket
• accusative for motion into: into the basket

So:

• in qualo = in the basket
• in qualum = into the basket

Because the sentence uses in + ablative, and the form qualo is ablative.

A very common Latin pattern is:

• in + ablative = in/on a place
• in + accusative = into/onto a place

Also, the verb is est = is, which describes a state, not movement. So the sentence is saying where the olive is located.

Because it agrees with oliva.

In Latin, adjectives agree with the nouns they describe in:

• gender
• number
• case

Here:

• oliva is feminine singular nominative
• so the adjective must also be feminine singular nominative
• therefore: fracida

If the noun were masculine or neuter, the adjective would change form.

Because oliva is in the nominative singular, which is the usual case for the subject.

In this sentence:

• oliva = nominative singular → likely subject
• fracida = adjective agreeing with oliva
• in qualo = prepositional phrase showing location
• est = is

So oliva fracida is the thing being talked about: the rotten olive.

Because Latin does not have articles like English the and a/an.

So oliva can mean:

• an olive
• the olive
• sometimes just olive

The exact English translation depends on context. In a simple sentence like this, English often uses the: The rotten olive is in the basket.

Because Latin word order is much more flexible than English word order.

English strongly prefers:

• The rotten olive is in the basket.

Latin can place words in different orders for style or emphasis, and it is very common for the verb to come at or near the end:

• Oliva fracida in qualo est.

That word order sounds normal in Latin.

Yes. Latin allows both positions.

So both of these are possible:

• oliva fracida
• fracida oliva

Both mean rotten olive.

Sometimes word order can create slight differences in emphasis or style, but in a basic sentence like this, the meaning is the same.

The dictionary forms are:

• oliva, olivae — olive
• fracidus, fracida, fracidum — rotten, overripe, decayed
• in — in, on, into, depending on case
• qualus, quali — basket
• sum, esse — to be

The form est comes from sum, esse and means he/she/it is.

Because the subject oliva is singular.

Latin verbs change form to match the subject:

• singular subject → singular verb
• plural subject → plural verb

So:

• oliva ... est = the olive ... is
• olivae ... sunt = the olives ... are

Sometimes Latin can omit a form of to be, especially in certain styles, but in a straightforward sentence like this, est is perfectly normal and clear.

So Oliva fracida in qualo est is a complete, standard sentence.

Without est, the sentence might still be understandable in some contexts, but for a learner, keeping est is the simplest and most natural way to say it.

It is a real Latin word, but it is not one of the very first vocabulary items many learners meet.

So if qualo looks unfamiliar, that is probably why. The important grammar point is still very useful:

• qualus = basket
• in qualo = in the basket

Even if the noun itself is less common, the construction is very common.