Bad is an adjective and badly is an adverb. Use the adjective bad when referring to human feeling.
Example: I felt bad. [If you said, “I felt badly,” you’d be saying that there was something wrong with your sense of touch.]
Badly is an adverb, but it is often mistakenly used as an adjective.
Incorrect: He wanted badly to go with them.
Correct: He wanted very much to go with them.
Incorrect: She felt badly after her operation.
Correct: She did not feel well after her operation.
In conversation, back-channeling is a natural response that shows you understand what a person is saying by using interjections such as I see, yes, okay, and uh-huh.
The usual slash (/) is sometimes called a forward slash ...