I must remember:
1. so + adjective The day was so cold that...
2. such (-/a/an) + noun / such(-/a/an) + adjective+ noun It was such a cold day that...

Rewrite the sentences as in the example.
e.g It was such a difficult problem that nobody could solve it. (such + adjective + noun)
- The problem was so difficult that nobody could solve it. (so + adjective)

1. It was such a nasty experience that we'll never forget.
-.
2. It was such a big city that I got lost.
- .
3. The film was so interesting that we saw it twice.
-.
4. The day was so beautiful that I didn't want to go to school.
-.
5. It was such a cold weather that we had to take our coats.
-.
6. The lecture was so boring that I almost fell asleep.
- .
7. The day was so lovely that they decided to go for a drive in the country.
-.
8. It was such a heavy box that I couldn't lift it.
-.
9. The chair was so uncomfortable that nobody could sit on it.
-.
10. The car is so old that we can't sell it.
-.