Поставить в Present Continuous: 1)Olga (dance) now. 2)They (sing) at the moment. (+)(?)Да. Нет. Почему? С кем, Кто? (-). Все на англ., (+) ан.+рус.

1. Olga is dancing now.
   (+) Yes, she is dancing now.
   (-) No, she is not dancing now.
   (?) Is Olga dancing now?

2. They are singing at the moment.
   (+) Yes, they are singing at the moment.
   (-) No, they are not singing at the moment.
   (?) Are they singing at the moment?

Пояснение: Present Continuous используется для описания действий, которые происходят в данный момент времени. Например, "is dancing" и "are singing" указывают на текущие действия.