For those, who are interested in the more theoretical part of the language we would like to discuss the differences between pronouns, adverbs, prepositions and conjunctions. For those of you, who are not really interested in linguistics - just go on to the next page.
Pronoun <=> adverbs
Pronouns substitute something known, they stand for something else (as already the name says), which was mentioned before. Adverbs specify something mentioned before.
A mixture of both are pronominal adverbs.
Your shoes are dirty. (your = possessive pronoun)
I did not want to come yesterday. (yesterday = adverb) Inbetween you can do whatever you want (inbetween = pronominal adverb)
conjunction <=> adverbs
Conjunctions connect phrases with each other. Adverbs specify something. A mixture of both is called conjunctional adverb, it specifies something and connects phrases.
He does not know, nevertheless he talks about it.
Adverbs describe the place, time or manner of things, interrogative adverbs ask just about these.
How do you want to do it? Why don't you go home? Where does he live? When does he start working?
Just a short word about the difference in interrogative words, there are (as just mentioned) the interrogative adverbs, asking about circumstances. Further, there are interrogative pronouns, asking about objects (which, what, who).