Both mean "to commence", but "start" is more everyday and physical; "begin" is more formal and used for processes.
To commence something, especially something with structure or duration. More formal than "start". Common in written texts.
The meeting will begin at nine sharp. Please be on time.
La reunion comenzara a las nueve en punto. Por favor sean puntuales.
She began to cry when she heard the news.
Ella empezo a llorar cuando escucho la noticia.
Let us begin with a brief review of last week's material.
Comencemos con un breve repaso del material de la semana pasada.
To commence something. More everyday. Also: to set in motion (an engine, a physical process).
Can you start the car? The engine is not turning over.
¿Puedes arrancar el coche? El motor no enciende.
I always start my day with a cup of coffee and the news.
Siempre empiezo mi dia con una taza de cafe y las noticias.
The race will start in five minutes. Runners, take your positions.
La carrera comenzara en cinco minutos. Corredores, tomen sus posiciones.
Common mistake
In most contexts, "begin" and "start" are interchangeable. The key difference: "start" is the only correct choice for physical or mechanical objects ("start the car / start the engine / start the computer"). "Begin the car" does not exist. For processes, events, and actions, both work, though "begin" sounds slightly more formal.
Trick to remember it
Engine or machine: always "start". Formal speech, meeting, ceremony: "begin" sounds better. Everything else: choose freely. Register trick: written or formal contexts (a book, a conference, a contract), "begin" fits better. Everyday conversation: "start" is the most natural.
Quick rule
Machines and engines: "start". Everything else: interchangeable, "begin" more formal.
Did you know?
"Begin" has an irregular past: begin / began / begun. "Start" is regular: start / started / started. This is one of those verbs where modern English has been gradually replacing the irregular Anglo-Saxon verb ("begin") with the more regular and simpler one ("start"). In 500 years, "begin" may disappear from everyday English entirely.
Exercise 1 · Pick the right one
She could not _____ the lawnmower. The engine would not fire up.
Exercise 2 · Pick the right one
The professor _____ the lecture with a surprising statistic about sleep.
Exercise 3 · Form the word
Machines and engines: "start". Everything else: interchangeable, "begin" more formal.
In most contexts, "begin" and "start" are interchangeable. The key difference: "start" is the only correct choice for physical or mechanical objects ("start the car / start the engine / start the computer"). "Begin the car" does not exist. For processes, events, and actions, both work, though "begin" sounds slightly more formal.
Engine or machine: always "start". Formal speech, meeting, ceremony: "begin" sounds better. Everything else: choose freely. Register trick: written or formal contexts (a book, a conference, a contract), "begin" fits better. Everyday conversation: "start" is the most natural.
Bryan López
Founder of SpeakUP Academy