Subject clauses do not seem to be marked by a special non-manual marker, but there is an intonational break between the main verb and the subject clause. Verbs like seem, be_astonishing, strange and obligation are uttered with a lexically specified non-manual marker which stops when the intonational break occurs. Therefore, the boundary of the subject clause is marked by this interruption. Another marker of the boundary between the subject clause and the verb that takes it as an argument is body lean, as indicated in the examples below.