Ex1:Quá khứ phân từ
1.sell- sold 10.come- come
2.stand- stood 11.is- been
3.drink- drunk 12.make- made
4.change- changed 13.feel- felt
5.walk- walked 14.send- sent
6.know- known 15.put- put
7.brush- brushed 16.tell- told
8.iron- ironed 17.shower- showered
9.comb- combed