[ابو بيشو]

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That that is is that that is not is not is that it it is is an English word sequence demonstrating syntactic ambiguity. It is used as an example illustrating the importance of proper punctuation.[1]
The sequence can be understood as any of three grammatically-correct sequences, each with at least three discrete sentences, by adding punctuation:
That that is, is. That that is not, is not. Is that it? It is.
That that is, is that that is. Not is not. Is that it? It is.
That that is, is that that is not. Is not "is that" it? It is.
The first two relate a simple philosophical proverb in the style of Parmenides that all that is, is, and that anything that does not exist does not. The phrase was noted in Brewer's Dictionary of Phrase and Fable.[2]
This phrase appeared in the 1968 American movie Charly, written to demonstrate punctuation to the main character Charly's teacher, in a scene to demonstrate that the surgical operation to make the character smarter had succeeded.[3]
Lexical ambiguity[edit]
Demonstrations of words which have multiple meanings dependent on context.
• In port, the portly porter ported the port, through the port port. (At the dock, the fat mover moved the wine, through the left window)
• Will, will Will will Will Will's will?[1]
• Time flies like an arrow; fruit flies like a banana
• Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo. (Buffaloes from Buffalo, NY, whom buffaloes from Buffalo bully, bully buffaloes from Buffalo.)
• Rose rose to put rose roes on her rows of roses. (Robert J. Baran) (Rose [a person] rose [stood] to put rose [pink-colored] roes [fish eggs as fertilizer] on her rows of roses [flower].)
• James while John had had had had had had had had had had had a better effect on the teacher[2] (With punctuation: "James, while John had had 'had', had had 'had had'. 'Had had' had had a better effect on the teacher".)
• That that is is that that is not is not is that it it is(Grammatically corrected as: "That that is, is. That that is not, is not. Is that it? It is").
• If it is it, it is it. If it is, it is it, it is! (If an object is the object, it is the object. If it is the object, then it is the object, it is!)
• A ship-shipping ship shipping shipping ships (A boat-delivering boat delivering delivery boats)
• He jarred ajar a jar of Jar-Jar's jarred charred chard and char giardiniera.
• That that exists exists in that that that that exists exists in.
• Better betters better betters better better better better betters better.
• Can can can can can can can can can can. ("Examples of the can-can dance that other examples of the same dance are able to outshine, or figuratively to put into the trashcan, are themselves able to outshine examples of the same dance". It could alternatively be interpreted as a question, "Is it possible for examples of the dance that have been outshone to outshine others?" or several other ways.)
• If police police police police, who police police police? Police police police police police police.[3] (If the police police is what you might call the people who supervise, monitor, and maintain order amongst the regular police force, then who, in turn, supervises the police police? The answer: the police police police. Hyphenating the noun constructs makes this easier to follow. Therefore, "[The] police-police [, that the] police-police-police police [, themselves] police [the] police", which means that "the police-police, who are policed by the police-police-police, are themselves responsible for policing the regular police force". In these sentences, the word police is used both as a collective noun ("police force") and as a verb ("to police [someone or something]"). This clause is also a reduced relative clause, so the word that, which could appear between the second and third words of the sentence, is omitted.)
• In a similar vein, Martin Gardner offered the example: "Wouldn't the sentence 'I want to put a hyphen between the words Fish and And and And and Chips in my Fish-And-Chips sign' have been clearer if quotation marks had been placed before Fish, and between Fish and and, and and and And, and And and and, and and and And, and And and and, and and and Chips, as well as after Chips?"[4] This sentence is much easier to read because the writer placed commas between and and & and and and And, & and and and And & and And and and, & and And and and & and and and And, & and and and And & and And and and, & and And and and & and and and. (46 ands in a row).