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Ajudar vs. auxiliar

While both ajudar and auxiliar translate to "to help" or "to assist" in English, they are not always interchangeable in Portuguese. The primary difference lies in their formality and context. Ajudar is a general, everyday term, whereas auxiliar is more formal and often used in professional or technical settings.

Ajudar

A1
Ajudar is the most common and versatile word for "to help". It can be used in virtually any situation, from informal, simple favors to offering significant support, both physically and emotionally. It is the go-to word for helping in daily life.
Podes ajudar-me a carregar estas caixas?
(Can you help me carry these boxes?)
Ela sempre ajuda os colegas com os trabalhos de casa.
(She always helps her classmates with their homework.)
Os meus amigos ajudaram-me a mudar de casa.
(My friends helped me move house.)
Um bom livro pode ajudar a relaxar antes de dormir.
(A good book can help to relax before sleeping.)
Ouvir os outros com atenção ajuda a criar boas relações.
(Listening carefully to others helps to build good relationships.)
Ele ajudou a senhora idosa a atravessar a rua.
(He helped the elderly lady cross the street.)

Auxiliar

B1
Auxiliar means "to assist" or "to aid" and is more formal and specific than ajudar. It is typically used in professional, medical, technical, or official contexts. It often implies a subordinate or secondary role, providing support to a main person or process in a structured environment.
O enfermeiro vai auxiliar o médico durante a cirurgia.
(The nurse will assist the doctor during the surgery.)
O estagiário foi contratado para auxiliar o departamento de marketing.
(The intern was hired to assist the marketing department.)
Os bombeiros auxiliaram as vítimas do incêndio.
(The firefighters aided the victims of the fire.)
O técnico irá auxiliar na instalação do novo equipamento.
(The technician will assist with the installation of the new equipment.)
O professor assistente auxilia o professor principal nas aulas.
(The teaching assistant assists the main professor in the classes.)
A função deste software é auxiliar os utilizadores na gestão de tarefas.
(The function of this software is to assist users in task management.)

Summary

In essence, use ajudar for general, everyday helping in any context. It is the most common and safest choice. Use auxiliar for more formal situations, especially in professional, technical, or medical settings where the help is more of a structured assistance or a specific, often subordinate, role. Think of ajudar as "to help" and auxiliar as the more formal "to assist" or "to aid".