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The Spanish verbs "conocer" and "saber" both translate to "to know" in English, but they are used in different contexts.
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"Conocer" is generally used to express familiarity or acquaintance with people, places, or things. For example, you would use "conocer" when you say you know a person (e.g., "Conozco a María" means "I know María") or if you are familiar with a city (e.g., "Conozco Madrid" means "I know Madrid").
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"Saber," on the other hand, is used to express knowledge of facts, information, or how to do something. For example, you would use "saber" when you know a piece of information (e.g., "Sé la respuesta" means "I know the answer") or when you know how to perform an action (e.g., "Sé nadar" means "I know how to swim").
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a.) Erica tiene bloques en la bolsa. --> Erica los tiene en la bolsa.
b.) The direct object pronoun "los" is correct in this context because it refers to "bloques," which is a masculine plural noun in Spanish. Direct object pronouns in Spanish must agree in gender and number with the noun they replace. Since "bloques" is plural and masculine, the appropriate direct object pronoun to use is "los."