I kept thinking that a sentence such as "She would often be angry with me for no reason" was "correct," but I was afraid to.
If you think that you might say, or might have heard, a construction, then don't hesitate to say so. It might be a spur to some of us to re-think a hasty judgement. Some teachers, both native and non-native, do have an unfortunate tendency to reject the evidence of their own ears/eyes, and label something as incorrect simply because it does not fit in with what they have read in some grammar book.
Remember that grammarians do not claim to be style guides. They attempt to describe the language as it is actually used. It is not physically possible for any writer, or team of writers, to give their opinion on every utterance. Remember, to, that probably more words are spoken and written in English every single day than are contained in all the corpora put together.
You, Parser, one native speaker, have almost certainly written or said more than 25,000,000 words in your life; probably ten times as many. The impressive British National Corpus contains only 100 million words.
Thanks for all the questions you have answered, and my last question about it.
As you have said, In 1999, I always used to go to the cinema, but now I like the theatre.
Not natural. We do not use ‘used’ to with specific times in the past, though we can use it with more general times, such as ‘when I was a child’.
That is ok, but does it contain 'would' in the past habits also?
Ten years ago, he would come here (often). (repeated action)