1. How long has Mrs. Clown been waiting for you?
2. How long have the children been watching TV?
3. How long has the Tyrons been walking in the park?
4. How long has Mary been cleaning the flat?
1. How long has Mrs. Clown been waiting for you?
2. How long have the children been watching TV?
3. How long has the Tyrons been walking in the park?
4. How long has Mary been cleaning the flat?