|A. tene=S||S sit|
|B. tene=A=O||A sit O (down)|
|C. tene=CS||CS is (CC, adjective, peripheral phrase)|
|D. auxiliary V-tene||V-ing|
Tene in senses A and B means ‘sit’. As an intransitive, the subject is the person or thing sitting. As a transitive, it acquires a causative meaning, with the object being the person or thing sitting and the subject is the cause. Tene behaves very much like sede, including in the use or not of a causative and a passive and with peripheral arguments.
As a copula and as an auxiliary, tene has all the uses of sede, except that where sede requires a class I subject, tene is used for all other classes of subject (II, III, IV). So, when a verb has a class I subject, use sede as the progressive auxiliary. Otherwise, use tene.