Both this was happened and they were spoke are ungrammatical and should be avoided.
If you are talking about the past, you say, "This happened to me."
You wouldn't use was or were with a V2 (unless V2 ends with -ing), although you can use has and had, depending on what you are trying to say. All of these are grammatical:
This has happened to me several times before.
This had happened to me three times, until I finally figured out how to fix the problem.
This was happening to me three times a day, until I grew tired of it.
As for the adverb, in many cases (such as in the two-word snippet you provided in your question), adverbs can either precede or come after the verb. Quite often, where you decide to place the adverb entirely depends on personal preference. Let me say that again, just to be clear: In those cases, where you put the adverb depends entirely on personal preference. However, one can't always place an adverb arbitrarily, as StoneyB mentioned in a comment to this answer – it depends on the words used, and the structure of the surrounding sentence.
In the future, though, those are two different questions, and they should be asked as two different questions, not combined as one.