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.

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The verb estar (to be) in the present tense is conjugated as follows:

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

To demonstrate the use of the verb estar, here's a sentence using the form "él está":
Él está estudiando para su examen. (He is studying for his exam.)

To conjugate the verb "estar" in the present tense, you need to take its stem "est-" and add the appropriate endings for each subject pronoun. Here are the conjugations:

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

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

Sentence: Yo estoy en casa. (I am at home.)

In this sentence, we used the first-person singular form of "estar" - "estoy" - to express the idea of being at home.

surely you have conjugation tables for estar ...