2.People send plastic bags to factories for recycling
→  plastic bags were sent to factories for recycling

 3. They designed a greeting cards a long time ago
→ a greeting cards was designed a long time ago

4. Mai made some toys from used cans .   
→   some toys were made from used cans  by Mai

5. They will build a new school next year
→  a new school will be built next year

6. We will do English test next week
→ English test will be done  next week

7.Nam hasn’t played games on line
→games online haven't been  played by Nam