La profesora quiere que leamos veinticinco versos antes del seminario.

Because querer que normally triggers the subjunctive.

In this sentence, La profesora quiere que... means The teacher wants that..., so what follows is something desired, not simply stated as a fact. That is why Spanish uses the present subjunctive:

• leamos = present subjunctive of leer
• leemos = present indicative, which would not fit after quiere que

So:

• La profesora quiere que leamos... = The teacher wants us to read...

Here leamos means that we read.

It is the first person plural form of leer in the present subjunctive:

• yo lea
• tú leas
• él/ella lea
• nosotros/nosotras leamos
• vosotros/vosotras leáis
• ellos/ellas lean

So in this sentence:

• quiere que leamos = wants us to read

Even though leamos can sometimes mean let’s read in other contexts, that is not what it means here. The structure quiere que + subjunctive clearly gives the meaning wants us to read.

No. In leamos, the letters le- are just part of the verb leer.

A learner might see leamos and wonder if it contains the pronoun le, but it does not. The whole word is simply a verb form:

• infinitive: leer = to read
• subjunctive: leamos = that we read

So there is no separate pronoun there.

Que introduces the second clause: what the teacher wants.

The sentence has two parts:

• La profesora quiere = The teacher wants
• que leamos veinticinco versos antes del seminario = that we read twenty-five verses before the seminar

In Spanish, after verbs like querer, esperar, preferir, and similar expressions, que is often used before a new clause with a different subject.

Compare:

• La profesora quiere leer. = The teacher wants to read.
  Same subject: the teacher is the one reading.

• La profesora quiere que leamos. = The teacher wants us to read.
  Different subject: the teacher wants us to do it.

Because the subject changes.

Spanish typically uses:

• verb + infinitive when the subject stays the same
• verb + que + subjunctive when the subject changes

So:

• La profesora quiere leer.
  The teacher wants to read.
  The teacher is both the one who wants and the one who reads.

But in your sentence:

• La profesora quiere que leamos...
  The teacher wants us to read.
  One person wants; different people do the reading.

That change of subject is why Spanish uses que leamos instead of an infinitive.

Because de + el contracts to del.

So:

• de + el = del
• a + el = al

That means:

• antes del seminario = before the seminar

This contraction is required in normal Spanish, except when el is part of a proper name, such as El Escorial.

Not exactly.

• verso usually means verse or line of poetry
• poema means poem

So veinticinco versos most naturally means twenty-five lines of verse or twenty-five verses, not twenty-five poems.

Depending on context, verso can sometimes refer more broadly to poetic verse, but it is not the same as poema.

Because after a number, Spanish usually goes straight to the noun without an article.

So:

• veinticinco versos = twenty-five verses

That is the normal pattern, just like:

• tres libros = three books
• diez minutos = ten minutes

You would only add an article if you meant a specific set already known from context, for example:

• los veinticinco versos = the twenty-five verses

It usually means before the seminar, and in many contexts that naturally implies before it starts.

Spanish does not need to spell that out unless the speaker wants to be extra precise. So:

• antes del seminario = before the seminar

In real use, listeners will understand the exact nuance from context. For example, a teacher assigning reading probably means before the seminar begins.

It can mean either, depending on context.

In Spain, profesor / profesora is widely used for a teacher, especially in secondary school and higher education. In English, the best translation may be:

• teacher
• professor
• lecturer

The sentence itself does not force only one English word. Since the meaning is already given to the learner, the main thing to notice is that:

• la profesora is feminine
• it refers to a female teacher/instructor

Yes, but it is usually unnecessary.

Spanish often leaves subject pronouns out because the verb form already shows the subject:

• leamos already tells you it means we

So:

• La profesora quiere que leamos... is the natural version.

If you say:

• La profesora quiere que nosotros leamos...

that adds emphasis or contrast, for example:

• The teacher wants us to read, not them.

So the pronoun is possible, but normally omitted.

It is pronounced with three syllables: le-a-mos.

The e and a are pronounced separately, not blended into one syllable. Roughly:

• leh-AH-mos

This happens because the verb comes from leer, which often keeps those vowels in separate syllables in many forms:

• leo
• leemos
• leamos

So it is not like a single sound such as lea in English spelling; it is clearly le-a-mos.