1.the laptop was on the chair. it on the table 2.the books on the shelf. they on the bed 3. the cat under the bed. it next to the door

Если я правильно поняла, что надо делать, то вот: 
1.The laptop was on the chair. It is on the table
2.The books were on the shelf. They are on the bed
3. The cat was under the bed. It is next to the door