Ответ:

Решение:

  1. She helped mother yesterday. (Past Simple, действие в прошлом)
  2. She did not help father yesterday. (Past Simple, отрицание в прошлом)
  3. Did she help sister yesterday? (Past Simple, общий вопрос в прошлом)
  4. How did she help sister yesterday? (Past Simple, специальный вопрос в прошлом)

Ответ: helped; did not help; Did help; did help.