Tu teléfono falla mucho, por eso nunca llamas.

Questions & Answers about Tu teléfono falla mucho, por eso nunca llamas.

How does por eso translate to "that's why"?
Literally, por eso means "for that." In Spanish, it is the standard and most natural way to say "that's why" or "therefore." It acts as a bridge connecting a cause (your phone failing) directly to its consequence (you never calling).
Why is there no accent mark on Tu?
Because here it is the possessive word "your" (tu teléfono). The version with the accent mark () is the subject pronoun "you" (as in, "you call"). Spanish uses the accent mark solely to tell these two identical-sounding words apart in writing.
Is falla the usual way to say a device is broken?
The verb fallar is perfect for saying a device is glitching, acting up, or dropping calls. It means "to fail" or "to malfunction." If the phone were completely dead or physically shattered, you would be more likely to say está roto (it is broken) or no funciona (it does not work).
Why doesn't mucho change its ending here?
Because it is describing the verb falla, not the noun teléfono. When mucho tells you how much an action happens (it fails a lot), it is an adverb. Adverbs never change their endings, so it will always stay mucho rather than becoming mucha or muchos.

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