The nighttime by the river canal is busy.
The daytime by the river canal is busy.
Nighttime and daytime are different times.
exists s1 x1 x2 x3.(n_canal(x2) & of(x2,x3) & n_river(x3) & n_nighttime(x1) & Theme(s1,x1) & a_busy(s1) & by(x1,x2))
exists s1 x1 x2 x3.(n_canal(x2) & of(x2,x3) & n_river(x3) & n_daytime(x1) & Theme(s1,x1) & a_busy(s1) & by(x1,x2))