What is the main idea of the passage?

The liar paradox shows how a self-referential sentence can resist an ordinary choice between true and false. (The opening creates the truth-value loop, and later paragraphs name self-reference and varied responses.)

Why do the labels chase each other in a circle?

Calling the sentence true implies falsehood, while calling it false seems to make its claim true. (The first paragraph demonstrates the reversal under either starting label.)

What does “self-reference” mean here?

language that refers back to itself (The second paragraph directly defines self-reference as the sentence pointing to itself.)

What do some logical systems add?

more than two truth values (The final paragraph identifies additional truth values as one family of response.)

The Sentence That Says It Is False: Level 1 Reading Comprehension Questions

Consider this sentence: “This sentence is false.” If it is true, then what it says must hold, so it is false. If it is false, then its claim of being false seems true.

This puzzle is called the liar paradox. It uses self-reference: the sentence points back to itself. Ordinary true-or-false labels seem to chase each other in a circle. Neither label settles quietly at once, because each one immediately invites its opposite.

Philosophers and logicians offer different responses. Some limit which sentences can speak about their own truth. Others use systems with more than two truth values. The puzzle matters because it shows that simple-looking language can strain the rules used to evaluate it.

Comprehension questions