用be动词的适当形式填空。
1. —__________ you at home yesterday?
—Yes, I __________.
2. —__________ it sunny in London now?
—Yes, it __________.
3. —__________ you at the park now?
—Yes, we __________.
4. —__________ your mother out yesterday?
—Yes, she __________.
5. —__________ they at school yesterday?
—Yes, they __________.