Conjunctions

https://blog.rosettastone.com/spanish-conjunctions/

Mientras

Me gusta escuchar música mientras limpio la casa.

Mientras siga entrenando a diario, estaré preparado para la carrera.

while, whilst, as, as long as
I like to listen to music while I clean the house.
As long as I keep training daily, I will be ready for the race.

Ni

Los veganos no comen ni carne ni huevos.

no es ni bueno ni malo

nor, neither
Vegans eat neither meat nor eggs.

It’s neither good nor bad

o

or

Así que

so, therefore

explains a decision, result, or consequence

Sino

No compramos un sofá sino compramos una silla.

instead, but

similar to pero, yet it is used to counterpose a negative statement:

We didn’t buy a sofa; instead, we bought a chair

Luego

ellos fueron a cenar luego fueron al teatro.

then

they went to dinner then they went to the theater