Теория:

Study the information about adverbs of manner.

Adverbs of manner tells us how something happens.
 
How did Jake behave? He behaved badly.

Adverbs of manner often have -ly.

The train went slowly.
  
blur-1239439_640.png
Рис. \(1\). Train
 
Other examples of adverbs of manner without -ly:

Better, best, early, high, hard, last, late, monthly, near, wide, worse.

Some adverbs have 2 forms but the meanings are different:

Hard/hardly
Last/lastly
Late/lately

The team played hard. (positive meaning)
The team hardly played at all. (negative meaning)
  
basketball-108622_640.png
Рис. \(2\). Team
Обрати внимание!
Some adjectives end in -ly: friendly, lively, lovely, sickly, silly, motherly, cowardly.

If you need to use these words as adverbs, you should say in a + adjective + way/manner/fashion.

Miss Brown always greets us in a friendly way.
  
greeting-5480092_640.png
Рис. \(3\). Greeting
Источники:
Рис. 1. Train, 2006, https://pixabay.com/images/id-1239439/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 2. Team, 2010, https://pixabay.com/images/id-108622/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 3. Greeting, https://pixabay.com/images/id-5480092/ Pixabay License CC0 Free for commercial use No attribution required