These are endings of the reflexive verb. Reflexive verbs in Russian have a number of meanings, notably:
- 'myself': я мно́го трениру́юсь 'I train (myself) a lot' — я мно́го трениру́ю свою́ кома́нду 'I train my team a lot',
- 'each other': они́ руга́ются 'they argue (curse each other)' — они́ руга́ют поли́тика 'they severely criticise/curse the politician',
- passive meaning: кни́га хорошо́ продаётся 'the book is sold well',
- to show the action directed at a subject that is unimportant: соба́́ка куса́ется 'the dog bites' (it doesn't matter whom it bites exactly).
As an American English speaker, I enjoy the mix of feelings I get when reading ".. it is spelt practise." It leaves me resisting an urge to "correct" this to "it is spelled practice," but also wanting to learn and understand all of the interesting differences between what is considered correct in US, UK & Australian English. (Having different spellings for the noun and verb forms of practice makes so much sense, and "spelt" is a nice, more efficient spelling of "spelled".)
Yes, always interesting. Defense/defence is another one. Invariably 's' in American use and 'c' on the UK side of the pond (except before 'i' - e.g. defensive). Also the accent is on 'De' (US) and 'fence' (UK). (Please correct me if I'm wrong.) Think I'll go out for a spell and buy some spelt. (A type of wheat.)
"I practice a lot" would usually be translated «я мно́го практику́юсь».
American English speaker here.. This is the first I've encountered that rule, which I am presuming is common practice in the UK and perhaps elsewhere, but it's not in the States. I like it though! It makes sense to have distinctive spellings for these different uses. (I suppose that could also lead us to "it makes sence!") :)
I'm pretty sure it's two syllables. Whenever you're uncertain about a pronounciation (as on Duolingo they're good, but far from perfect) I usually go to forvo.com which has a LOAD of pronounciations in pretty much any language you could hope for. Тренируюсь is also there, pronounced with ую as two syllables.