REWRITE:
1. Put on your coat than we can leave. (soon)
We can leave............................................................................on your coat
2. If you don't start training soon, you won't win the championship. (unless)
You won't win the championship...................................training soon.
3. It was smaller than other phone in the shop. (smallest)
It.................................................................................................................
4. Because it was rainy, the flight was delayed. (rain)
....................................................................................................................
5. It was such a good class that they decided to go regularly. (so)
The class................................................................................................