ASL syntax
And again!
Mental_floss, whose URL I don’t think I can post here, has a very nice article by Arika Okrent explaining “why sign language interpreters look so animated”-a response to some of the clueless comments made about Lydia Callis, who went viral after interpreting for the mayor of New York during Hurricane Sandy.
There you can see (with photo examples) that “movements of the head and eyebrows indicate sentence-level syntactic functions” like topicalization, conditionality, etc. Linguaphile awesomeness!