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.

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/as estamos (We are)
- Vosotros/as estáis (You all are)
- Ellos/Ellas/ustedes están (They/You all - formal - are)

Example sentence: Estoy cansado después de un largo día de trabajo. (I am tired after a long day of work)

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/as estamos (we are)
- Vosotros/as estáis (you all are)
- Ellos/Ellas/Ustedes están (they/you all are)

Here's an example sentence using one of the forms:

Yo estoy en casa (I am at home).

To conjugate the verb "estar" in the present tense, follow these steps:

1. Identify the subject of the sentence (yo, tú, él/ella/usted, nosotros/nosotras, vosotros/vosotras, ellos/ellas/ustedes).
2. Remove the -ar ending from the infinitive verb "estar" to get the stem.
3. Add the appropriate ending to the stem based on the subject.

Here are the forms of the verb "estar" in the present tense:

- 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)

Now let's form a sentence using one of the forms:

"Yo estoy en casa" (I am at home)

In this sentence, "yo" is the subject, so we use the form "estoy" to match with the subject. The sentence means "I am at home."