Краткое пояснение:
Используется Present Simple, так как действие происходит регулярно (usually, in autumn). Поэтому глагол должен быть в 3-м лице единственного числа.
Решение:
- The sentence describes a habitual action that occurs regularly, indicated by the adverbs 'usually' and 'in autumn'. This calls for the use of the Present Simple tense.
- In the Present Simple tense, verbs referring to a third-person singular subject (their aunt) take an '-s' or '-es' ending.
- Looking at the options: 'flew' (Past Simple), 'has flown' (Present Perfect), 'flies' (Present Simple, 3rd person singular), 'will fly' (Future Simple).
- The correct verb form to complete the sentence is 'flies'.
Ответ: flies