Theory:

An adverb is a word used to modify a verb, an adjective, or another adverb.
Adverbs often end in -ly, but some (such as slow) look the same as their adjective counterparts.
Example:
1. Hulk is very strong.
2. The movie finished too quickly.
3. Unfortunately, Tony stark died.
Adverbs and Verbs: 
Adverbs modify verbs. This means that they describe the way an action is happening.
Example:
1. Thor fights fiercely with Loki.
- How does Thor fight? Fiercely.
 
2. I waited impatiently for the Endgame.
- How did I wait? Impatiently.
 
3. I will seriously consider your suggestion.
-  How will I consider your suggestion? Seriously.
Adverbs and adjectives:
Adverbs modify adjectives. Adjectives describe a noun. For example in the sentence Ram is tall, The word tall describes Ram, the noun. But the adjective tall can be modified with adverbs like very, extremely etc.
Example:
1. Hermoine is very studious.
2. Hagrid is extremely tall.
3. Wonder woman was really awesome.
Adverbs modifying another adverb:
Adverbs describe verbs. For example, in the sentence "He runs fast", the adverb fast describes the action run. But adverbs like very, so, extremely can modify the adverb fast.
Example:
1. Dhoni hit the stumps so quickly.
2. Ronaldo is running very fast.
There are different types of adjectives:
1. Adverb of manner - Adverb of manner describes an event or how something happens.
Example:
i. Hulk jumped from the building angrily.
ii. Nobita does his homework regularly.
iii. It is raining heavily in Kochi.
iv. Scooby follows Shaggy loyally.
  
2. Adverb of frequency: Adverb of frequency describes how often an action occurs. The most commonly used adverb of frequency are, always, usually (or normally), often, sometimes, rarely, and never.
Example:
i. Shinchan always plays pranks.
ii. One must never bully others.
iii. I was badly in need of support after my poor performance.
iv. We should never move down from a moving bus.
v. The doctor examined Jake Burton immediately.  
  
3. Adverb of time: Adverb of times describes when an action took place and for how long.
Example:
i. I cut the cake exactly at midnight.
ii. He reached by 12 in the evening.
iii. I played ludo yesterday
Adverbs from the lesson "That Sunday Morning":
1. The cow bellowed loudly
2. He sat down on the road
3. I said that haughtily
4. I think we should move quickly
5. Some of them were running madly
6. Both of us moved fast enough
7. The cycle stopped abruptly
8. I could only cling on helplessly
9. On the first Sunday there, we decided to explore
10. After cycling for half an hour, my brother got bored
11. I pedalled as fast as I could
12. I gradually moved ahead