Here are the corrected sentences:
1. Last Sunday Tom and his dad didn't go to the beach. They went for a walk in the forest.
2. His mum made pizza for them. She made sandwiches for them.
3. Tom took his phone. He took his camera.
4. His dad took his passport. He took a map.
5. They saw a giraffe. They saw a bear.
6. Tom was happy. He was scared.
7. The bear chased them. The bear ran away. It ran away.