grammar.adverbs.quantity
Quantity adverbs: muy, mucho, poco, bastante, demasiado
Muy + adjective/adverb (muy caro); mucho after verbs (trabaja mucho). As adjectives, mucho/poco/demasiado agree: muchas cosas.
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Explanation
Quantity adverbs say how much. The key contrast is muy vs mucho: muy modifies adjectives and adverbs (muy caro, muy rápido, muy bien), while mucho modifies verbs (trabaja mucho, llueve mucho) and can stand alone as an answer (¿te gusta? — mucho). You can never say *muy mucho; the intensified form is muchísimo.
When these words come before a noun, they're really adjectives and must agree in gender and number: mucho trabajo, muchas cosas, poca gente, pocas opciones, demasiada burocracia.
Other useful members: bastante ('quite / enough', invariable as an adverb), demasiado ('too much'), apenas ('barely'), casi ('almost'), and tan ('so', before adjectives/adverbs — tan caro). Bastante and demasiado also agree when they precede a noun: bastantes problemas, demasiados autos.
Examples
The procedure is very slow and costs a lot.
Region: global
There's too much bureaucracy.
Region: global
The procedure is very slow and there are too many people, but it's moving along quite a bit.