1)They are sitting in the shade of a tree.,他们坐在树阴下乘凉。2)They are sitting in the shade of a tree.,他们坐在树阴下。3)It' s cool and shady under the tree.,在树下很阴凉。4)They be under a tree .,他们在树下。5)He is -ing the cool air,他在乘凉。6)They were playing chess under the tree.,他们在树下下棋。