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"Necesito" is a form of "necesitar", a transitive verb which is often translated as "to need". "Hace mucho sol" is a phrase which is often translated as "it's very sunny". Learn more about the difference between "necesito" and "hace mucho sol" below.
necesitar(
neh
-
seh
-
see
-
tahr
)
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
transitive verb
a. to need
Necesito canela para la tarta.I need some cinnamon for the cake.
An auxiliary verb, or helper verb, is a conjugated verb that comes before a main verb and determines the main verb's tense, mood, or aspect (e.g., I have gone.).
auxiliary verb
a. to need
Necesitan salir ya si quieren alcanzar su vuelo.You need to leave now if you want to make your flight.
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hace mucho sol(
ah
-
seh
 
moo
-
choh
 
sohl
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. it's very sunny
¿Qué tal tiempo hace hoy en Málaga? - Hace mucho sol y calor.How is the weather in Malaga today? - It's very sunny and hot.
b. it's really sunny
Solo me pongo el gorro cuando hace mucho sol.I only wear my hat when it's really sunny.
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