Yes, adverbs can indeed be intensified by other adverbs, and this often alters the degree or extent of the action or quality being described. This process is known as adverbial modification. Here are some examples to illustrate how adverbs can intensify each other:
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Very + Quickly: "She ran very quickly." (Here, "very" intensifies the degree of "quickly," suggesting that she ran at a high speed.)
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Extremely + Well: "He plays the guitar extremely well." (In this case, "extremely" intensifies "well," indicating a very high level of skill.)
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Remarkably + Eagerly: "They accepted the offer remarkably eagerly." (This means they accepted it with a notably high level of eagerness.)
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Surprisingly + Slowly: "The car moved surprisingly slowly." (Here, "surprisingly" adds an element of unexpectedness to the slowness of the car's movement.)
When combining adverbs in this way, it’s important to ensure that the intensifiers are appropriate for the context, as overuse or inappropriate combinations can lead to awkward or unclear sentences.