Отнесите факты, о которых идет речь, сначала к будущему, затем к прошлому, используя соответствующие формы глагола to be:
1. there are twelve ctudents in our group.
2. there is a beautiful garden near the house.
3. there is a big blackboard in the classroom.
4. there is a letter for him on the table.
5. there are two lifts in the house.