I'd like to return the English teacher that i borrowed last week.
Why not "teachers have been loaned"?
That would be Walimu wamekopesheka (or also Walimu wamekopeshwa).
When stative verbs are in the present tense, the tend to be interpreted with the "potential" meaning, "be -able/-ible". To talk about the resulting state, you'll use the perfect tense.
Does this mean the teachers can be loaned (as in sent to another school, perhaps) or that the teachers can receive loans?
Now i got it. Thks Ernst.