In Latin est is singular. est plural is sunt
(Tu) est magister [male]/magistra [female].
Criteria is plural. Criterion is singular. Don't mess with Latin!
"You are" would be "es", if it is singular, or "estis", if it is plural.
A "Pilus" is the Latin for a hair, so following the Latin rules for plurals, the plural is "pili".
The word "data" is technically a plural noun. However, it is commonly used in both singular and plural contexts in modern English.
Alumna is a Latin word. (It is the feminine form of alumnus, plural alumni).And the feminine Latin plural of alumna is alumnae.
Tu (singular) Vos (plural)
The word "dicta" is a Latin plural. The singular is dictum.
No, 'Deus est meus vires' doesn't mean 'God is my strength'. Instead, Deus est vis mea is the Latin equivalent. In the first, incorrect example, the noun 'vires' is in the feminine plural and the possessive adjective 'meus' is in the masculine singular. Latin nouns and their adjectives must agree in both gender [feminine/masculine/neuter] and number [singular/plural]. In the word by word translation, the noun 'Deus' means 'God'. The verb 'est' means '[he/she/it] is'. The noun 'vis' means 'strength'. The possessive adjective 'mea' means 'my'.
Tu (singular). Vos (plural).
'Tu' is the singular 'you.' 'Vos' is the plural 'you.'
Tu. (singular) Vos. (plural)