They lived here since 2015.

Correction: Present Perfect Continuous or Present Perfect

This sentence uses the Past Simple tense ('lived') with 'since 2015'. The word 'since' indicates a duration of time continuing up to the present, which requires either the Present Perfect or Present Perfect Continuous tense.

Corrected Sentence Options:

1. They have lived here since 2015. (Present Perfect)
2. They have been living here since 2015. (Present Perfect Continuous)

Explanation: The Present Perfect and Present Perfect Continuous tenses are used to describe actions or states that started in the past and continue to the present. 'Lived' is the past tense, implying the action is completed, which contradicts 'since 2015'.