user: Question: What is the future stem for the word that has an imperfect stem of hartzen?
Columns: ['Perfect stem', 'Future stem', 'Imperfect stem', 'Short stem', 'Meaning']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['hartu', 'hartuko', 'hartzen', 'har', "'take'"]
SQL:

assistant: SELECT "Future stem" FROM "Table" WHERE "Imperfect stem" = 'hartzen';