tuve que o tenía que
I am still perplexed about when to use "tuve que" and when to use "tenía que." So far, the best that I can do is that "tuve que" means I had to, and possible did, and only on one occasion. "Tenía que" seems to mean I had to in an abstract sense, with no time restriction, and may not have actually done so. Or, I was supposed to. Some specific examples along with guidelines would be very helpful here. Merely saying that it depends on context is, by itself, of no help.
1 Answer
I have been pondering my own question. I think that I know the answer now. If I want to say that I had to do something and I actually did it (because I had to do it), then because it was a completed action, I think that preterite is correct. If I want to say that I was supposed to do something or that I (emphasis on I) had to do something (because no one else would do it if it was to get done), then imperfect is correct because there is no suggestion that I actually started or finished the action. Last month, the car wash was broken, so I had to wash my own car. That doesn't mean that I actually did so. Hence I would use imperfect. Nevertheless, a native speaker is going to have to settle this matter.