Sauk, or Ma Manda, is one of the Finisterre languages of Papua New Guinea.
A detailed grammar of the language was published by Ryan Pennington in 2016.
Ma Manda has a switch-reference system in which verbal suffixes on non-final verbs in a clause chain indicate whether the subject of the following clause is the same as or different from the current subject. The same-subject suffix is -ka (SS) and the different-subject suffix is -ng (DS).
In this example, the same-subject suffix -ka on ba ('come') indicates that its subject is identical to that of ngat ('be'). The different-subject suffix -ng on ngat signals that the subject changes before the following impersonal clause tandonta-go-k ('it became night').