Isnt

Isn't is a contraction of the English phrase is not. It is used to negate a clause whose finite verb is the present tense of to be and whose subject is third person singular (he, she, it). The contraction is formed by combining is with not, with the letters o in not dropped and replaced by an apostrophe, yielding isn't.

Usage is common in spoken English and in informal writing. In formal or careful prose, writers may prefer the full form is not. Isn't can appear in questions as well as in statements: Isn’t it dangerous? He isn’t ready yet.

Phonology and variation: The usual pronunciation is roughly as if the sequence is + not is said quickly, often transcribed as /ˈɪz.ənt/ in standard varieties. In rapid speech, the vowel may be reduced and the t can be lightly released or even elided in some dialects, leading to slight variations such as /ˈɪznt/.

Related forms and orthography: The counterpart contractions for other forms of to be include aren’t (are not) and am not (rarely contracted as aren’t, and am not is typically written as am not). The nonstandard variant isnt (without an apostrophe) appears in informal online text but is regarded as incorrect in standard writing.

Etymology and history: Isn't emerged in early modern English as contractions of common auxiliary verbs with not, following a broader trend toward shortening negations in English. See also contraction (grammar) for a broader overview of similar forms.