Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:

Convert text to sql: Find the last names of all the teachers that teach GELL TAMI. | list : lastname , firstname , grade , classroom | teachers : lastname , firstname , classroom | 

### Response:

select _ from _ where _ | select teachers.lastname from list join teachers on list.classroom = teachers.classroom where list.firstname = 'GELL' and list.lastname = 'TAMI'