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"El narrador" is a form of "narrador", a noun which is often translated as "narrator". "En este caso" is a phrase which is often translated as "in this case". Learn more about the difference between "en este caso" and "el narrador" below.
en este caso(
ehn
ehs
-
teh
kah
-
soh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. in this case
En este caso, tenemos que aplicar la regla de tres simple.In this case, we have to use the rule of three.
el narrador, la narradora(
nah
-
rrah
-
dohr
)This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).