6. The children **are doing** homework now.
7. I **am taking** a shower at the moment.
8. Tom **is playing** board games with his friend now.
9. The girl **is riding** a bike now.
10. They **are going** to school now.
**Объяснение:**
Present Continuous образуется с помощью формы глагола 'to be' (am, is, are) и глагола с окончанием -ing. Формула: подлежащее + am/is/are + глагол + -ing.