Hello! One more stupid question! ) I've asked about it in another thread which relates to the history of Russian, but I think that it's a special theme. There is the verb do in English. It has different forms for the Present Tense 3d person singular (does), the Past Tense (did) and Participle II (done). I'm very interested where its endings -es, -d and -ne have come from. I can suppose that -es might have some relation to is (maybe I'm wrong of course). But I have no ideas about -d (or -id?) and -ne. And what about such forms as would, could, had? Has -d in them come from did, or it's just of the same origin as -d in did? Please excuse me, if it was already discussed somewhere - I've found nothing similar.