How to Say "grubs" in Spanish
The Spanish word for “grubs” is “gusanos” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
NounA1
Larvae of certain beetles

Examples
Mi abuelo usa gusanos como cebo para pescar.
My grandfather uses worms as bait for fishing.
Si dejas la fruta afuera mucho tiempo, saldrán gusanos.
If you leave the fruit out too long, maggots will appear.
Los gusanos de seda producen fibras muy valiosas.
Silkworms produce very valuable fibers.
Masculine Plural Noun
Since 'gusanos' ends in -os, it is a masculine noun in its plural form. This means you must use masculine plural words like 'los' (the) or 'estos' (these) before it.
Using the wrong article
Mistake: “La gusanos (Incorrect use of feminine 'la').”
Correction: Los gusanos (Use the masculine plural 'los' to match the noun's gender).
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