in autumn it is often cold, in summer it isn't cold
in autumn nights are long and dark, in summer nights aren't long and dark.
in autumn the sky is often grey, in summer the sky isn't grey
in autumn the wind is cold and strong, in summer the wind isn't cold and strong.
in autumn trees are red red and yellow, in summer trees aren't red and yellow.
in autumn schoolchildren are at school, in summer schoolchildren aren't at
school.