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"Since then" is an adverb which is often translated as "desde entonces", and "from then on" is a phrase which is also often translated as "desde entonces". Learn more about the difference between "since then" and "from then on" below.
since then(
sihns
thehn
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
a. desde entonces
I quit smoking six years ago, and I've been much healthier since then.Dejé de fumar hace seis años y, desde entonces, he estado mucho más sano.
from then on(
fruhm
thehn
an
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. desde entonces
They fell out at university and, from then on, never spoke again.Se pelearon en la universidad y desde entonces no volvieron a hablar.
b. a partir de ese momento
From then on, you will no longer be able to access your account.A partir de ese momento, ya no podrás acceder a tu cuenta.
c. de ahí en adelante
I decided to go self-employed eight years ago and have had steady work from then on.Decidí hacerme autónoma hace ocho años y de ahí en adelante nunca me faltó trabajo.