Entre mayo y junio, la profesora nos aconseja subrayar el título y las ideas principales.

Entre ... y ... means between ... and ....

In this sentence, Entre mayo y junio gives a time frame: between May and June or during the period from May to June.

A learner might expect de mayo a junio, which is also possible in some contexts, but entre mayo y junio focuses on the interval between those two points.

In Spanish, the names of months are normally written in lowercase:

• mayo
• junio
• enero
• septiembre

This is different from English, where May and June are capitalized.

They are only capitalized in Spanish if they begin a sentence or are part of a title that uses capitalization for stylistic reasons.

Spanish often uses the definite article (el, la, los, las) where English would not.

So la profesora means the teacher. It sounds natural in Spanish to identify the person this way.

In many cases, Spanish uses the article with professions or roles when talking about a specific person:

• La profesora nos aconseja...
• El médico llega tarde.

English usually leaves the article out in some contexts, but Spanish often keeps it.

Nos means us or to us, depending on the verb.

Here, in la profesora nos aconseja, it means the teacher advises us.

So:

• la profesora = the teacher
• nos = us
• aconseja = advises

It is referring to the people receiving the advice.

Spanish object pronouns usually go before a conjugated verb.

So:

• La profesora nos aconseja... = The teacher advises us...

This is the normal placement with a finite verb like aconseja.

Compare:

• Nos aconseja subrayar...
• not Aconseja nos...

Spanish pronoun placement is one of the big differences from English.

Both patterns are possible in Spanish, but they work a little differently.

Here, aconseja subrayar uses an infinitive:

• aconsejar + infinitive
• literally: advises [us] to underline

This structure is very common.

You could also say:

• La profesora nos aconseja que subrayemos el título y las ideas principales.

That version uses que + subjunctive (subrayemos). It can sound a little more explicit or formal.

So the sentence you were given is completely natural and common.

Because it depends on aconseja.

The structure is:

• aconsejar + infinitive

So:

• aconseja subrayar = advises [someone] to underline

The infinitive in Spanish often works like English to + verb:

• leer = to read
• escribir = to write
• subrayar = to underline

Subrayar means to underline.

It is commonly used in school or study contexts:

• subrayar el título = underline the title
• subrayar las ideas principales = underline the main ideas

It is a very normal academic verb in Spanish.

Because the nouns are different in number:

• el título = the title → singular
• las ideas principales = the main ideas → plural

Each noun phrase needs its own article:

• el with singular masculine título
• las with plural feminine ideas

So the sentence is listing two things to underline:

1. el título
2. las ideas principales

In Spanish, adjectives usually come after the noun.

So:

• ideas principales = main ideas

This is the normal order in Spanish, even though English usually puts the adjective before the noun:

• main ideas

Also, principales agrees with ideas:

• ideas = feminine plural
• principales = plural form

Notice that principal has the same form for masculine and feminine in the singular:

• idea principal
• tema principal

But the plural is:

• ideas principales
• temas principales

Título has a written accent because of Spanish stress rules.

It is pronounced with the stress on the first syllable:

• TÍ-tu-lo

Words stressed on the third-to-last syllable are called esdrújulas, and they always take a written accent in Spanish.

So:

• título ✅
• titulo ❌ in this meaning

Also note that titulo without an accent can be a verb form from titular in some contexts, so the accent matters.

Yes. Spanish word order is flexible, especially with time expressions.

The original sentence is:

• Entre mayo y junio, la profesora nos aconseja subrayar el título y las ideas principales.

You could also say:

• La profesora nos aconseja subrayar el título y las ideas principales entre mayo y junio.

Both are grammatical, but putting Entre mayo y junio at the beginning helps set the time frame right away.

Yes, depending on who receives the advice.

For example:

• me aconseja = advises me
• te aconseja = advises you
• nos aconseja = advises us
• os aconseja = advises you all (common in Spain)
• les aconseja = advises them / you all (common in Latin America and also possible elsewhere)

Since you asked about Spanish from Spain, it is useful to notice os, which is the informal plural you form used in Spain.

Usually, yes.

With a noun, you would normally say:

• La profesora aconseja a los alumnos subrayar el título y las ideas principales.

Here, a los alumnos is the group receiving the advice.

When that noun is replaced by a pronoun, you get:

• La profesora nos aconseja...

So nos is standing in for something like a nosotros or a los alumnos.