La secretaria revisa la agenda antes de confirmar la cita por teléfono.

In Spanish, nouns usually need an article unless they are being used in a very specific way. So la secretaria means the secretary.

Using no article here would sound incomplete in normal Spanish. English often drops articles more easily than Spanish does.

Also, secretaria is the feminine form. The masculine form is secretario.

Usually, yes, but depending on context it can overlap with ideas like administrative assistant or office staff. In this sentence, the secretary is the most natural translation.

Be careful not to confuse la secretaria (the female secretary) with la secretaría (the office/department/secretariat). The accent changes the meaning:

• secretaria = secretary
• secretaría = department, office, secretariat

Revisa is the simple present of revisar. In Spanish, the simple present is used very often where English might use either:

• reviews
• is reviewing

So La secretaria revisa la agenda... can mean:

• The secretary reviews the diary/planner... as a routine action, or
• The secretary is reviewing the diary/planner... depending on context

Spanish uses the progressive form (está revisando) less often than English uses is reviewing.

Not exactly. In Spanish, la agenda very often means:

• a diary
• a planner
• a schedule book
• an appointment book

In English, agenda often means a list of topics for a meeting, but in Spanish agenda commonly refers to the place where appointments are written down.

So in this sentence, la agenda is probably the appointment book / planner / schedule.

Yes, agenda is feminine: la agenda.

This one is straightforward. Some learners get confused because there are nouns beginning with stressed a- that take el in the singular, like el agua or el aula, but agenda is not one of those cases. So it stays:

• la agenda
• las agendas

Because antes is followed by de before an infinitive.

So:

• antes de confirmar = before confirming / before she confirms

This is a standard structure in Spanish:

• antes de salir = before leaving
• antes de comer = before eating
• antes de llamar = before calling

You cannot normally say antes confirmar.

Both are possible in Spanish, but they are used in different situations.

Use antes de + infinitive when the subject is the same:

• La secretaria revisa la agenda antes de confirmar la cita. The secretary reviews the planner before she confirms the appointment.

Use antes de que + subjunctive when the subject changes or when you want to state the second action with its own subject:

• La secretaria revisa la agenda antes de que el director confirme la cita. The secretary reviews the planner before the director confirms the appointment.

So in your sentence, antes de confirmar is used because the secretary is doing both actions.

Yes, cita can mean either:

• appointment
• date

Context tells you which one is meant. Because the sentence involves a secretary, an agenda, and confirming by phone, la cita clearly means the appointment.

Examples:

• Tengo una cita con el dentista. = I have a dentist appointment.
• Tengo una cita con Ana. = I have a date with Ana / I have an appointment with Ana, depending on context.

Because confirmar takes a direct object, not a.

So:

• confirmar la cita = to confirm the appointment

The preposition a is not used here because la cita is a thing, and it is the direct object of confirmar.

Compare:

• confirmar la reserva = confirm the reservation
• confirmar la reunión = confirm the meeting

Por teléfono means by phone or over the phone.

It is a fixed expression in Spanish:

• hablar por teléfono = to talk on the phone
• confirmar por teléfono = to confirm by phone

Spanish uses por here, not en. So:

• por teléfono = correct
• en teléfono = not natural Spanish

Because por teléfono is a set expression, and in this meaning Spanish normally does not use the article.

It refers to the means of communication in a general way:

• por teléfono = by phone
• por correo = by mail
• por internet = online / via the internet

You might see el teléfono in other contexts when referring to a specific phone:

• Está al lado del teléfono. = It is next to the phone.

But for the method of communication, por teléfono is the usual form.

Because it naturally modifies confirmar: she confirms the appointment by phone.

Spanish word order is flexible, but the end position is very natural here. It keeps the sentence clear:

• first action: revisa la agenda
• then time relationship: antes de
• second action: confirmar la cita
• method: por teléfono

You could move it for emphasis, but the original order is the most neutral:

• La secretaria revisa la agenda antes de confirmar la cita por teléfono.

Spanish uses definite articles more often than English does.

In English, you might sometimes say:

• Secretary reviews appointment book before confirming appointment by phone

But in normal Spanish, articles are usually required:

• la secretaria
• la agenda
• la cita

Even when English sounds more natural without the, Spanish often still uses el / la / los / las.

In Spain, especially in standard Peninsular Spanish, c before i is usually pronounced like the th in thin.

So:

• cita sounds roughly like THEE-ta
• teléfono has the stress on lé because of the accent mark: te-LÉ-fo-no

A rough Peninsular pronunciation of the whole sentence is: La sekretaria rebisa la aJENda antes de konfirmar la THIta por teléfono

That said, accents vary across Spain, and in many parts of the Spanish-speaking world cita would sound more like SEE-ta.

It could be either. The simple present in Spanish is flexible.

It can describe:

• a habitual action: The secretary usually reviews the planner before confirming the appointment by phone
• a process or narration: The secretary reviews the planner before confirming the appointment by phone

Without more context, both are possible. Spanish often leaves that kind of distinction to context more than English does.