1. When my brother and I (be) were children, we (have) had two cats and a dog.
2. It's 8.00 now. We (learn) are learning math. At 9.00, we (have) will have a history class.
3. Lien's brother is an architect but he (not work) isn't working at the moment.
4. How much does it (cost) cost to mail a letter to England?
5. We are decorating our house because we (have) are going to have a birthday party tonight.