Learn Spanish (Latin America): Siempre escuchamos al profesor atentamente. - We always listen to the teacher attentively.

You start with the adjective atento (attentive). First, change it to its feminine form, atenta. Then, just add the ending -mente. This works just like adding "-ly" in English to make "attentively".

In English we say "listen to". Is the a in al the word for "to"?

No, the verb escuchar already means "to listen to" all by itself. The a in al (which is a combination of a + el) is the "personal a". In Spanish, you must put an a before a direct object if it is a specific person, like el profesor.

Why is there no word for "we" before escuchamos?

You could say nosotros siempre escuchamos, but it is optional. The -amos ending on escuchamos already tells us the subject is "we", so native speakers usually leave nosotros out unless they want to emphasize who is doing the listening.

Can escuchamos also mean "we listened" in the past?

Yes! For regular Spanish verbs ending in -ar, the "we" form is exactly the same in both the present tense and the simple past tense. However, because this sentence uses siempre (always) to talk about a routine, we know it is using the present tense here.