She opened the box.
Meaning: This sentence describes the girl's action of opening a particular box.
Choice of Words: She is a personal pronoun that refers to a female person. Opened is the past tense of the verb "to open" and it indicates that the action of opening the box occurred in the past. The is a definite article that is used before nouns to specify a particular one. Box is a common noun that refers to a container with a lid.
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Related Expressions