Magistra addit pronomen interrogativum saepe quaestionem significare.

Because magistra is nominative singular and makes good sense with addit: the teacher adds.

Also, addit often introduces an indirect statement in Latin. Here, pronomen interrogativum ... significare forms that indirect statement, so magistra is the subject of the main verb, while pronomen interrogativum belongs to the infinitive clause.

Addit is:

• 3rd person singular
• present tense
• active voice
• indicative mood

It comes from addo, addere, meaning to add or to say in addition.

So magistra addit means the teacher adds or the teacher further says.

Because Latin commonly uses an accusative-and-infinitive construction after verbs of saying, thinking, knowing, and similar verbs.

So instead of saying:

• The teacher adds that ... often signifies ...

Latin says, more literally:

• The teacher adds [an interrogative pronoun] often to signify a question

But in normal English we translate this as:

• The teacher adds that an interrogative pronoun often signifies a question.

So significare is infinitive because it is part of an indirect statement.

Because in this kind of sentence Latin usually does not use a separate word meaning that.

English says:

• The teacher adds that ...

Latin usually uses:

• a verb of saying or thinking
• plus an accusative subject
• plus an infinitive

That whole structure does the job that that does in English.

It is the subject of the infinitive significare inside the indirect statement.

In English, we would think of it as:

• an interrogative pronoun = the thing doing the signifying

In Latin indirect statement, the subject of the infinitive is put in the accusative.

So grammatically, pronomen interrogativum is the subject of significare, even though it appears in the accusative construction rather than in the nominative.

Good question. Pronomen is a neuter singular noun, and in Latin the nominative and accusative forms of neuter singular nouns are often identical.

So:

• nominative singular: pronomen
• accusative singular: pronomen

They look the same.

We know it is functioning as the accusative subject of the infinitive because of the construction after addit.

Interrogativum is an adjective modifying pronomen. It means interrogative.

It agrees with pronomen in:

• gender: neuter
• number: singular
• case: accusative here in the indirect statement

So pronomen interrogativum means an interrogative pronoun.

Quaestionem is the direct object of significare.

So the idea is:

• an interrogative pronoun often signifies
• a question

Its form is accusative singular, from quaestio, quaestionis.

Saepe is an adverb meaning often, and it modifies significare.

So it tells us how often the interrogative pronoun signifies a question.

Even though the word order may feel unusual from an English point of view, the sense is:

• often signifies

From an English perspective, yes, a little. But it is normal Latin.

Latin word order is much more flexible than English word order. Here the sentence is arranged as:

• Magistra addit = main clause
• pronomen interrogativum saepe quaestionem significare = indirect statement

Latin often places important ideas in positions that feel natural rhetorically, not necessarily in the fixed order English expects.

Here it is being used as a grammar term, not necessarily as one specific word in context.

It means an interrogative pronoun, such as a pronoun used in asking a question, for example words like who? or what? in English.

So the sentence is making a general grammatical point about interrogative pronouns.