What does this sentence mean:
I am worried about your talking a lot.
1-I am worried because I know that you did talk a lot at a specific occasion and you might have annoyed the people you were talking to.
2-I am worried that you might have talked a lot...
3-I am worried because you might talk a lot...
4-I know that you will talk a lot and am worried that you might say something you shouldn't say. I am worried about what your talking a lot might have as a consequence
All of your interpretations of the example sentence are possible. Only with context can I be certain which one applies. (It could be more than one of them.)
In this sentence, a lot implicitly means too much.I am worried about your talking a lot.