Помогите Why (they / want) to change their books? do или are? и почему?

Question

Помогите Why (they / want) to change their books? do или are? и почему?

Answer 1

Ответ:

Why do they want to change their books

Объяснение:

Answer 2

Why do they want to change their books?

Это предложение в Present Simple,поэтому вспомогательный глагол do.