I sometimes struggle with sentences that involve lots of changes of personal pronouns (I, him, they, and then his, hers, mine, etc). Although I am reasonably smart, and can do it easily in writing, for some reason when I go to construct sentences like this verbally, I know what I am trying to say, but it all gets mixed up and comes out in the wrong way. It is much worse when I am stressed, or tired.
I wonder sometimes why I battle with foreign languages, when I have this issue in my native language.
And sometimes under pressure I can't construct a sentence at all. I think that's why I can't do small talk. If I am in a roomful of strangers, or even with one person who gives me bad vibes, it's like my mind goes completely blank and there are no words in there at all.