is
v.v. used to describe a person, thing, or situation. You use it to give information about someone or something, like their name, age, or job.
v. the third-person singular present indicative form of 'be'. Functions as a linking verb to connect a subject with its complement or as an auxiliary verb to form continuous tenses and the passive voice.
She is a doctor at the local hospital.
The weather is quite cold today, so you should wear a heavy coat when you go outside.
While the theory is sound in a controlled laboratory setting, its practical application is often hindered by the unpredictable nature of real-world variables.
From Proto-Indo-European h₁ésti ("is"), a form of the root h₁es- meaning "to be". The word descends through Proto-Germanic wesaną, "to be", whose stem isti yields Proto-West Germanic *ist and then Old English is, unchanged through Middle English to the present.
Cognates remain recognisable across Germanic: West Frisian is, Dutch is, German ist, Yiddish איז (iz), and Afrikaans is, which has absorbed the functions of "am" and "are" as well. Old Norse and Old Swedish supply er and är, variants of the same stem.
The form *h₁ésti also produced Latin est, Ancient Greek ἐστί (estí), Sanskrit अस्ति (asti), Persian است (ast), and Russian есть (jestʹ). All carry the same meaning, though English has kept the third-person singular as the sole surviving present tense of "to be".
Alternative pronunciation of us.
From i + -s.
Third-person singular form; pairs with singular subjects like 'he', 'she', 'it', or singular noun phrases.
They is happy.They are happy.'Is' is only used for singular subjects; plural subjects require 'are'.