CursoLección 50/87

for, since y ago: duracion, punto inicial y momento pasado

"for + duration. since + starting point. ago + time + past simple."

La regla

for + duracion. since + punto inicial. ago + tiempo + past simple.

Los tres marcadores se confunden mucho. "for" indica DURACION: "for 3 years", "for 2 hours". "since" indica un PUNTO de inicio: "since 2020", "since Monday", "since I joined Nexora". "ago" cuenta hacia atras desde ahora y va con past simple, NO con present perfect: "3 years ago", "two days ago". Trampa hispana: "desde hace 3 años" no se traduce "since 3 years" (incorrecto); las opciones correctas son "for 3 years" o "since 3 years ago".

Ejemplos

I have lived in Murcia for 10 years.

Llevo 10 años viviendo en Murcia.

I have lived in Murcia since 2016.

Vivo en Murcia desde 2016.

I moved to Murcia 10 years ago.

Me mude a Murcia hace 10 años.

She has worked at Nexora since May.

Trabaja en Nexora desde mayo.

We have been waiting for two hours.

Llevamos esperando dos horas.

I started learning English five years ago.

Empece a aprender inglés hace 5 años.

He has been here since 9am.

Lleva aquí desde las 9 de la manana.

Casos típicos

for + duracionfor + period

for 3 yearsfor 2 hoursfor a long time

since + punto inicial concretosince + point

since 2020since Mondaysince May

since + clausula con past simplesince + subject + V2

since I joined Nexorasince she arrived

ago + tiempo, con past simpletime + ago + past simple

I started 3 years ago.She left an hour ago.

Trampas hispanohablantes

I have lived here since 3 years.I have lived here for 3 years. / since 3 years ago.

since no acepta duracion; necesita un punto.

I have started 3 years ago.I started 3 years ago.

ago va con past simple, no con present perfect.

I moved here for 2016.I moved here in 2016.

for no se usa para años como punto inicial; para un año usa in (past simple) o since (perfect).

She has worked here ago two months.She started working here two months ago. / She has worked here for two months.

ago va detras del tiempo y con past simple.