The accusative singular in every (non-neuter) declension we have ends in this letter.
What is m?
This is the location of the verb in most Latin sentences.
What is at the end of the sentence?
This is the difference between LAETUS and LAETE.
What is LAETUS is an adjective, LAETE is an adverb?
This is the Latin verb the little boy, who is a thief, is doing in this sentence.
What is laborat?
This role in a sentence is the noun to whom the action is done.
What is the direct object?
This is what Catia carries when she goes into the bar.
What is a sword?
When you place a line upon an A,
it's now this case and number.
What is ablative singular?
This is the ending for all "they" verbs.
What is -nt?
Iam, interdum, semper and nimium are all this.
What are adverbs?
This is the Latin verb Sabina and Iulia are doing in this sentence.

What is rident?
What is in the verb?
This is how the city is at the start of the story.
What is noisy?
This is the "standard" nominative singular ending of the third declension.
What is there isn't one / none?
This is the only verb we know that doesn't use -o as the first person singular ending.
What is sum?
This is the common element of the prepositions ad and per.
This is the Latin word for the bird in this picture.

What is psittacus?
This is the technical name of the verb form that means to verb.
What is the infinitive?
What is she's British?
After a preposition of motion towards, the object goes in the accusative case, but after a preposition that indicates motion away, it's this one.
What is the ablative?
This is the ending that allows you to command a group of people.
What is -te?
This is the unique feature of in, as far as we're concerned.
What is it takes both the accusative and ablative?
This is the Latin word for the people in the stands.

What is turba?
This is where the object of a preposition has to be.
What is after the preposition?
This is why Rufina and Quartilla are anxious.
What is they don't like chariot races?
In the neuter gender, the same ending is used by these two separate yet equally important cases.
What are the nominative and accusative?
In a sentence with a predicate noun or adjective, the verb is usually one of these.
(We can take the Latin term, if you prefer to use it.)
What is a linking verb or copula?
Adjectives have to agree with their nouns in three properties: gender, and these two.
What are case and number?
This is the Latin verb Faustus is doing in this sentence.

What is vituperat?
In the sentence EQUUS EST MAGNUS, EQUUS is the subject, whereas MAGNUS is this.
What is a predicate adjective?
These are the people the merchants are trying to attract.
Who are the married ladies?