1. Why don't we have a picnic tomorrow?
   What about having a picnic tomorrow?
2. It took him many hours to find out his lost keys.
    He spent many hours finding out his lost keys.
3. The washing machine is out of working.
The washing machine doesn't work
4. She spends 5 hours studying English.
-> It takes she 5 hours to study English.
2. Let's visit the museum this afternoon.
   shall we visit the museum this afternoon?
3. Let's sing that song.
    shall we sing that song