As a wilderness educator, and a student of native traditions and languages, I've noticed the definite lack of a "to
be" verb. It seems that every modern language has it, but no "native" languages.
Author Martin Prechtel speaks quite earnestly on this subject, in regards to the Tiwa (Pueblo) and Tzutujil Mayan languages, in his books,
Long Life - Honey in the Heart, Secrets of the Talking Jaguar, and
The Toe Bone and the Tooth.