Write the following articles and nouns in their plural forms:

el lápiz
la nariz
el profesor
el ratón

los lápices

las narices
los profesores
los ratones

To form the plurals of the given articles and nouns, we need to follow some basic rules in Spanish.

1. El lápiz (the pencil) - To make it plural, we change "el" to "los" (the) and "lápiz" to "lápices" (pencils).
Plural form: los lápices (the pencils)

2. La nariz (the nose) - To make it plural, we change "la" to "las" (the) and "nariz" to "narices" (noses).
Plural form: las narices (the noses)

3. El profesor (the professor) - To make it plural, we change "el" to "los" (the) and "profesor" to "profesores" (professors).
Plural form: los profesores (the professors)

4. El ratón (the mouse) - To make it plural, we change "el" to "los" (the) and "ratón" to "ratones" (mice).
Plural form: los ratones (the mice)

Remember, in Spanish, the articles "el" and "la" change to "los" and "las" respectively, when referring to multiple things. Likewise, for nouns ending in -z, we replace the -z with -ces to form the plural.

los lápices

las narices
los profesores
los ratones