Adverbs of manner tell you the way an action is performed.
They answer the question how?
Usually, the adverb follows the verb.
• The students cheered enthusiastically when they were told that they were getting a holiday.
Sometimes, the adverb is placed before the verb to emphasise the manner of the action.
• He deliberately tripped the rude boy.
• She suddenly appeared out of nowhere.
Although many adverbs of manner end in -ly, not all do.
• She’s trying hard to impress the judges.