"I am lying alone and reading."

Translation: Я лежу один и читаю.

[kpagcha]

I don't understand why sometimes it's adverd + verb (I've come to see that most of the times it's this way) and others it's verb + adverb. How can I learn when to use each?

[deactivated user]

It really depends on the adverb. Some adverb work better after the verb, others before it. I suggest you just learn them one-by-one.

There is no real rule, just guidelines. I've translated the guidelines about the adverbial modifiers of manner here: https://www.duolingo.com/comment/11620891

[sresnik]

why not "я лежу сам ..." ?

[Alf-Sawman]

Сам is an emphatic (or intensive) pronoun, like "myself" or "himself" in English. (In English, these are similar to the reflexive pronouns, btw, although in reality they are separate: "I hurt myself today" = reflexive, whereas "I will do it myself" = intensive/emphatic.)

Hence, 'сам' in Russian doesn't mean alone, which is 'один' (m) or 'одна' (f).