He sat down at his desk and opened his book.
Meaning: This sentence describes a boy who sat at his desk and prepared his book for use.
Choice of Words: Sat is the past tense of the verb sit, which means to rest in a seated position. Desk is a piece of furniture with a flat surface used for writing or working. Opened is the past tense of the verb open, which means to make something accessible by moving it apart.
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Related Expressions