La factura del gas es mucho más alta de lo que me dijeron.

Questions & Answers about La factura del gas es mucho más alta de lo que me dijeron.

Why do we use de lo que here instead of just que?
We use de lo que because we are comparing an adjective (alta) to a whole clause with a conjugated verb (me dijeron). If you were comparing two simple nouns, you'd use que (like más alta que la otra). But when the second part of the comparison is an entire phrase meaning 'than what was said', you need a clausal comparative like de lo que.
Since factura is feminine, why don't we use de la que?
In clausal comparatives, you use del que, de la que, etc., when referring to a specific noun (for example, if you were comparing this bill to another bill). However, here the comparison isn't about another bill. De lo que refers to the abstract statement or amount (what they told me). Abstract concepts and undefined amounts always take the neuter lo.
Why is it mucho más alta and not mucha más alta to match the feminine noun factura?
In this sentence, mucho acts as an adverb modifying the adjective phrase más alta to mean 'much more'. Adverbs never change their gender or number, so it stays mucho regardless of the noun. If it were an adjective directly describing a noun, it would change to match it (for example, mucha gasolina).
Who is the subject of dijeron?
Dijeron is in the third-person plural. In Spanish, this form is often used for an impersonal 'they', much like in English, to refer to the company, the staff, or whoever gave the estimate, without needing to specify a concrete subject.

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