5 ...................................................... homework, didn't she?

Past Simple

1. Did Becky finish her homework, didn't she?

Explanation: This is a question with a tag question in the past simple. The main clause is in the past simple affirmative, and the tag question uses the negative of the auxiliary verb 'did'. The to-do list includes 'finish homework' with a cross, suggesting she did not finish it. However, the tag 'didn't she?' implies the speaker believes she did finish it, or is seeking confirmation. The most likely phrasing to lead into this tag question is 'Did Becky finish her homework...?'