Final answer:
The adverb in the sentence 'She was early' is 'early,' which describes the time aspect of when 'she' was present.
Step-by-step explanation:
In the sentence "She was early," the adverb is 'early.' The role of an adverb is often to modify verbs, adjectives, or other adverbs, providing additional information about how, when, where, to what extent, or under what conditions something happens. In this specific case, 'early' describes the time aspect of when 'she' arrived. It modifies the verb 'was,' indicating that her arrival occurred sooner than expected or required.
Examples of adverbs in other contexts include: 'He spoke loudly' (modifying the verb 'spoke'), 'The flower is very beautiful' (modifying the adjective 'beautiful') and 'She arrived quite early' (modifying the adverb 'early'). Remember, not all adverbs end with '-ly,' but they all serve the function of giving more detail to the actions and qualities in sentences.