I've been wondering if V(stem) + V (+ ending) is an actual grammar point or not. We tap into it with ~ます and ~はじめる, but actually all kinds of verbs can be combined in that way. Some of which even made it into the dictionary. We encounter them (maybe subconsciously) in all kinds of texts, and I'd like to know if there are some rules applied to it. e.g. Which is the main verb? Which one is supplementary? Are there verbs that always only appear as the leading verb and others that always only follow behind? Are there verbs that cannot be used in such combinations at all? etc.
I figured that the first is the main verb, and the second one is supplementary. So your suggestion sounds quite right, I think. But I've never seen any explanation for that and I wonder, if I can just combine any verbs in that fashion?
