Quick answer
"Certain" is an adjective which is often translated as "seguro", and "as well as" is a phrase which is often translated as "además de". Learn more about the difference between "certain" and "as well as" below.
certain(
suhr
-
tihn
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (definite)
a. seguro
What is certain is that technology will keep advancing.Lo que es seguro es que la tecnología seguirá avanzando.
2. (convinced)
a. seguro
I can't be completely certain, it's just a suspicion.No estoy completamente segura, es solo una sospecha.
3. (particular)
a. cierto
Certain things are better left unsaid.Ciertas cosas es mejor callárselas.
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as well as(
ahz
 
wehl
 
ahz
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (aditionally)
a. además de
The restaurant serves sushi as well as Chinese food.El restaurante sirve sushi además de comida china.
b. al igual que
I love to sing as well as dance.Me encanta cantar al igual que bailar.
c. y también
She saw his most recent movie, as well as a play he had been in.Ella vio su película más reciente, y también una obra teatral en la que había actuado.
2. (in comparisons)
a. tan bien como
I could never play soccer as well as my brother can. Nunca pude jugar al fútbol tan bien como puede mi hermano.
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