


Use "lie" when the subject is the one doing the reclining or resting, and use "lay" when the subject is putting or placing something else in a horizontal position.
The past participle of "lie" is "lain," as in "I have lain on the couch all day." The past participle of "lay" is "laid," as in "I have laid the book on the table."
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.

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