Cancelei o agendamento, renovei o documento e agendei o atendimento.

Because they are in the 1st person singular (I) of the pretérito perfeito in Brazilian Portuguese.

For regular -ar verbs, the ending for I in this tense is -ei:

• cancelar → cancelei
• renovar → renovei
• agendar → agendei

This tense is used for completed actions in the past, which is exactly what the sentence is expressing.

It is the pretérito perfeito do indicativo, often matched in English with the simple past:

• I canceled
• I renewed
• I scheduled

It usually refers to actions seen as finished. In this sentence, the speaker is listing three completed actions.

Portuguese often omits the subject pronoun when the verb ending already makes it clear who the subject is.

So:

• Cancelei o agendamento...
• Eu cancelei o agendamento...

Both are correct, but the version without eu is very natural and common.

The ending -ei already tells you the subject is I.

O is the masculine singular definite article, meaning the.

So:

• o agendamento = the appointment booking / the scheduled appointment
• o documento = the document
• o atendimento = the service / appointment / assistance

These nouns are masculine singular, so they take o.

A useful pattern: many nouns ending in -mento are masculine, such as:

• o agendamento
• o atendimento
• o pagamento

Yes, and that can be confusing.

• agendamento is the booking/scheduling itself, or the scheduled appointment slot
• atendimento is the service/assistance/actual appointment interaction

So in this sentence:

• Cancelei o agendamento = I canceled the booking / appointment
• Agendei o atendimento = I scheduled the service / arranged the appointment

In many real-life contexts, especially with public services, clinics, banks, or government offices:

• agendamento = the act or record of scheduling
• atendimento = the actual service you will receive

Not necessarily. It suggests the speaker canceled one scheduled item and then booked another one.

A likely real-world meaning is:

1. I canceled a previous appointment
2. I renewed the document
3. I scheduled the service again, or scheduled a different service

Portuguese often lists actions like this without explaining all the background, because context usually makes it clear.

Yes, very often.

In Brazilian Portuguese, both agendar and marcar can mean to schedule / to book.

• agendei o atendimento
• marquei o atendimento

Both are natural. The difference is mainly one of style and context:

• agendar sounds a bit more administrative/formal
• marcar is often more everyday/common

For things like medical appointments, meetings, or services, both are widely used.

The sentence follows a very common Portuguese pattern:

verb + object, verb + object, e + verb + object

• Cancelei o agendamento
• renovei o documento
• e agendei o atendimento

Yes, the order can be changed, but changing it can also change the emphasis or the natural flow.

For example:

• Renovei o documento, cancelei o agendamento e agendei o atendimento.

This is still grammatical, but it presents the events in a different order.

The commas separate items in a series of actions.

Portuguese punctuation here works much like English:

• action 1, action 2, and action 3

So:

• Cancelei o agendamento, renovei o documento e agendei o atendimento.

The final e means and, just like in English.

They are neutral to somewhat formal, especially:

• agendamento
• atendimento
• documento

This sentence sounds very natural in contexts like:

• government services
• healthcare
• office or administrative situations
• customer service

In more casual speech, some people might simplify parts of it, but the original sentence sounds completely normal and natural in Brazil.

The ending -ei is usually pronounced roughly like ay in English say, though not exactly the same.

Very approximate pronunciations:

• cancelei → kahn-seh-LEI
• renovei → heh-noh-VEI or reh-noh-VEI depending on accent
• agendei → ah-zhen-DEI or ah-jen-DEI depending on region

A few helpful notes:

• Brazilian r at the start of a word, as in renovei, is often pronounced like an English h
• g before e in agendei sounds like the s in measure or the zh sound
• The stress is on the last syllable in all three verbs:
  • can-ce-LEI
  • re-no-VEI
  • a-gen-DEI

Yes. Adding já can emphasize that the actions have already been completed.

For example:

• Já cancelei o agendamento, renovei o documento e agendei o atendimento.

This means something like:

• I already canceled the appointment, renewed the document, and scheduled the service.

It is optional. Without já, the sentence is still complete and natural.

Yes. Portuguese often avoids repeating the subject when it stays the same.

In English, you normally say:

• I canceled..., renewed..., and scheduled...

In Portuguese, the subject is often simply understood from the verb forms:

• Cancelei..., renovei... e agendei...

This is one reason Portuguese can sound more compact than English.