1. In autumn it is often cold. In summer it wasn't often cold.
2. In autumn nights are long and dark. In summer they weren't long and dark.
3. In autumn the sky is ofren grey. In summer it wasn't ofren grey.
4. In autumn the wind is cold and strong. In summer it wasn't cold and strong.
5. In autumn trees are red and yellow. In summer they weren't red and yellow.
6. In autumn schoolcholdren are at school. In summer they weren't at school.