Para continuos:

You were studying when she called.
Were you studying when she called?
You were not studying when she called.I was watching TV when she called.
When the phone rang, she was writing a letter

present continuos:
1 I'm doing my homework in the evening.
2 She's calling to her boyfriend.
3 He's running in the park.
4 My father is driving the new car.
5 My mom is making a delicious cake.