Guys. I am preparing for the TRKI-3, and although I have gotten reasonably good at picking the right verb aspect, I sometimes run into cases that just make me scratch my head. The lates case is пора- sometimes the verb that's right after it is HCB, but about a third of the time it is CB. I googled for example "пора начать" and "пора начинать", and get results for both. It must be that there's a difference in meaning... can somebody help?
THANKS!