Use there is / there are in the positive [✓], negative [✗] or question [?] form.
1. _
There is _ a cat on the scratching post. [✓]
2. _Are there__ two posters on the wall? [?]
3. _There aren't__ any sweets in the jar. [✗]
4. _Is there_ a fridge in the kitchen? [?]
5. _There isn't__ a television in the bedroom. [✗]
6. _There are_ twenty children in the class. [✓]