For the verb "to be" in the present tense:
* est (for he/she/it)
* suis (for I)
* es (for you, singular informal)
* êtes (for you, singular formal or plural)
* sommes (for we)
For the verb "to be" in the past tense:
* était (for he/she/it)
* étais (for I)
* étais (for you, singular informal)
* étiez (for you, singular formal or plural)
* étions (for we)
For questions:
* est-ce que... (is it that...?)
* est-il... (is he...?)
* est-elle... (is she...?)
* est-ce... (is it...?)
Examples:
* Il est beau. (He is handsome.)
* Je suis fatigué. (I am tired.)
* Tu es gentille. (You are kind.)
* Est-ce que tu as faim ? (Are you hungry?)
* Est-il arrivé ? (Has he arrived?)
The best way to choose the correct translation is to consider the subject of the sentence and the tense.