3. "We are cleaning our room." a. The boys say that b. The boys said that

Решение:

Преобразуем прямую речь в косвенную. Прямая речь содержит глагол "are cleaning" (Present Continuous). Вводная конструкция "The boys say" – Present Simple, "The boys said" – Past Simple. При переходе в косвенную речь из Present Continuous образуется Past Continuous, если вводная конструкция в Past Simple.

• 3.a. The boys say that they are cleaning their room.
• 3.b. The boys said that they were cleaning their room.

Ответ:

• 3.a. The boys say that they are cleaning their room.
• 3.b. The boys said that they were cleaning their room.