1. Write each of the forms of the verb estar in the present tense. Then demonstrate how to use the verb by writing a sentence using one of the forms.

2. Write the following articles and nouns in their plural forms
el lapiz
la nariz
el prefesor
el raton

1. The forms of the verb estar in the present tense are:

- estoy (I am)
- estás (you are)
- está (he/she/it is)
- estamos (we are)
- estáis (you all are)
- están (they are)

Sentence using one of the forms: Estoy en la biblioteca. (I am in the library.)

2. Plural forms of the articles and nouns:
- los lapices (the pencils)
- las narices (the noses)
- los profesores (the teachers)
- los ratones (the mice)

1. The forms of the verb "estar" in the present tense are:

- Yo estoy (I am)
- Tú estás (You are)
- Él/Ella/Usted está (He/She/You formal is)
- Nosotros/Nosotras estamos (We are)
- Vosotros/Vosotras estáis (You all are)
- Ellos/Ellas/Ustedes están (They/You all are)

Here is an example sentence using one of the forms of the verb:

- Estoy feliz de ver a mis amigos. (I am happy to see my friends.)

2. The plural forms of the articles and nouns are:

- Los lapices (the pencils)
- Las narices (the noses)
- Los profesores (the teachers)
- Los ratones (the mice)

1. To write each form of the verb estar in the present tense, we'll start with the infinitive form "estar" and conjugate it for each subject pronoun. Here are the conjugations:

- Yo estoy (I am)
- Tú estás (You are)
- Él/Ella/Usted está (He/She/You formal is)
- Nosotros/Nosotras estamos (We are)
- Vosotros/Vosotras estáis (You all are)
- Ellos/Ellas/Ustedes están (They/You all are)

To demonstrate the use of the verb, let's make a sentence using the form "él está":

Sentence: Él está estudiando para el examen. (He is studying for the exam.)

2. To write the articles and nouns in their plural forms, we need to consider the gender and number agreement. Here are the plural forms of the given words:

- los lápices (the pencils)
- las narices (the noses)
- los profesores (the teachers)
- los ratones (the mice)

Remember that in Spanish, the plural forms of articles and nouns often end in -s or -es depending on the word's ending and gender.