vs
QUICK ANSWER
"What" is a form of "what", a pronoun which is often translated as "qué". "Then" is an adverb which is often translated as "entonces". Learn more about the difference between "what" and "then" below.
what()
A pronoun is a word that stands in for a noun (e.g., she).
An adjective is a word that describes a noun (e.g., the big dog).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
then()
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
a. entonces
If you eat healthy food, then you won't get sick.Si comes comida sana, entonces no te enfermarás.