"he or she has"
This means either "he has" or "she has" not "he or she has"; does it not?
Yáʼátʼééh! This word is a postposition meaning "with him" / "with her" / "with it" / "with (the noun that preceeds the postposition".
Bee is one of a group of words that translates to “with or by means of (it).” Using it takes some practice, but it’s essential knowledge. Here’s an overview.
For reference: Shee would mean “with me”, nee means “with you”, and bee takes its place in the third person “with him/her/it”. These words follow special rules that makes bee (or yee – the other 3rd person form) relatively common.
In the next example sentence:
Shicheii télii bee hólǫ́.
The structure is:
maternal grandfather + a / the donkey / donkeys + with he / she / it / + he / she / it exists / they two exist
Literally, it is meaning:
My grandpa, he is with a donkey.
So, the translation would be:
(My) Grandpa has a donkey.
My guess is that the exercise shows an English translation, but inaccurate, and the Navajo translation would combine the words bee + hólǫ́.
I hope it helps. :)