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:
I. Adverb of manner - Adverb of manner describes an event or how something happens.
Example:
  1. Hulk jumped from the building angrily.
  2. Nobita does his homework regularly.
  3. It is raining heavily in Kochi.
  4. Scooby follows Shaggy loyally.
II. 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:
  1. Shinchan always plays pranks.
  2. One must never bully others.
  3. I was badly in need of support after my poor performance.
  4. We should never move down from a moving bus.
  5. The doctor examined Jake Burton immediately.  
III. Adverb of time: Adverb of times describes when an action took place and for how long.
Example:
  1. I cut the cake exactly at midnight.
  2. He reached by 12 in the evening.
  3. I played ludo yesterday.
Sentences that contain adverbs from the lesson:
  1. Two years ago we were passing through the sugarcane fields near Mysore - Adverb of time
  2. Unfortunately for the poor beast, one of my companions did not feel that way about it - Adverb of manner
  3. He promptly shot the bear on the spot - Adverb of manner
  4. Within a very few days he started eating and drinking everything else - Adverb of time
  5. Bruno entered the library as he often did - Adverb of frequency
  6. He was clearly weakening rapidly - Adverb of manner
  7. Ten minutes later his breathing was less stertorous - Adverb of time
  8. He promptly drank the lot - Adverb of manner
  9. He vigorously tackled anyone who came forward for a rough and tumble - Adverb of manner
  10. He immediately produced and cradled affectionately a stump of wood which he had carefully concealed in his straw bed - Adverb of manner
  11. Hastily, and before she could change her mind, a letter was written to the curator of the zoo - Adverb of manner
  12. We all missed him greatly - Adverb of manner