Answer:

1. An adverb is a word that modifies (describes) a verb.

2.

- Adverb of Manner : An adverb of manner modifies or changes a sentence to tell us how something happens, such as whether it was quickly or slowly. They're usually placed after the main verb or after the object.

- Adverb of Place : An adverb of place always talks about the location where the action of the verb is being carried out. Adverbs of place are normally placed after a sentence's object or main verb. Adverbs of place can refer to distances.

- Adverb of Time : An adverb of time is just what you might expect it to be – a word that describes when, for how long, or how often a certain action happened. You will notice that many adverbs of time are the same as adverbs of frequency.

- Adverb of Frequency : An adverb of frequency describes how often an action happens. There are six main adverbs of frequency that we use in English: always, usually (or normally), often, sometimes, rarely, and never.