Question

What is the following key word used for?

actually

sequence
adding an idea
explanation or illustration
emphasis and purpose
time
repetition and summary

Answer 1

The correct answer cannot be any of the other choices besides, sequence. 
If the answer was "Adding an Idea" it would have to be furthermore, yet, in addition, and other choices.  
The only category "Afterword" belongs in is a sequence. 

Answer 2

Answer:

The correct option is explanation or illustration.

Explanation:

Adverbs are commonly defined as words that describe or modify verbs, adjectives or other adverbs, explaining how, when, where, what extent and why. Particularly the word "actually" is an adverb that means in reality, in fact,  as a matter of fact, in truth,  in actual fact,  as it happens.

Bearing the explained above, it could be said that the keyword "actually" could be used for explanation or illustration of a particular idea.