Quick answer
"When" is an adverb which is often translated as "cuándo", and "only if" is a phrase which is often translated as "solo si". Learn more about the difference between "when" and "only if" below.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (in questions)
a. cuándo
When was the last time you cried?¿Cuándo fue la última vez que lloraste?
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
2. (relative)
a. cuando
I was sleeping when he got home.Estaba durmiendo cuando llegó a casa.
b. en que
That was the year when we bought our first apartment.Ese fue el año en que compramos nuestro primer apartamento.
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only if
A phrase is a group of words commonly used together (e.g once upon a time).
1. (general)
a. solo si
You can ask me a question, but only if you want an answer.Puedes hacerme una pregunta, pero solo si quieres una respuesta.
b. solamente si
We can achieve great things in life, but only if we try.Podemos lograr grandes cosas en la vida, pero solamente si lo intentamos.
c. únicamente si
We can achieve justice only if we give voices to the victims.Podemos lograr la justicia únicamente si damos voces a las víctimas.
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