根据例子，给下列的单词分类。
e. g. pencil penruler eraser
1. yellow green _______________ ________________
2. football basketball _______________ ________________
3. six nine _______________ ________________
4. coat vest _______________ ________________
5. father sister _______________ ________________1. red, blue 2. volleyball, ping-pang ball 3. twelve, eighteen 4. T-shirt, dress 5. mother, grandpa