Put 'there + be' in the tense and form indicated.
1. [?] problems that cannot be solved. (simple present, negative)
2. [?] only one bedroom in this house. (simple present, affirmative)
3. [?] good restaurants in this city. (simple past, affirmative)
4. [?] school yesterday? (simple past, interrogative)
5. [?] an error. (present perfect, affirmative)
6. [?] snow this winter. (future, negative)