Unlike the other Spanish Articles, and articles in English, lo is NOT used with noun.
|Lo can be used with a masculine singular adjective or past participle (the -ado and ido forms of regular verbs) to form a noun.|
|Lo unico que no me qusta ...||The Only Things I don;t Like...|
|Esto es lo importante.||That's the important thing.|
|Lo bueno de eso es que...||The Good Thing about it is That...|
|Sentimos mucho lo ocurriedo.||We are very sorry about what happened.|
lo can be used with an adjective followed by que to emphasize how big/small/beautiful and so on something is or was. The adjective must agree with the noun it describes.
|We didn't know how small the house was||No sabiamos lo pequena que era la casa.|
|You can't imagine how nice they are||No te imaginas lo simpaticos que son.|
lo can also be used in a similar way with an adverb followed by que.
|I Know how much you like music||Se lo mucho que te gusta la musica.|
lo can be used with de followed by a noun phrase to refer back to something the speaker and listener both know about
Spanish Comparatives And Superlatives Of Adjectives