In [2]:
def plural(n):
if n.endswith('s')or n.endswith('sh')or n.endswith('x')or n.endswith('ch'):
print(n+'es')
elif n.endswith('f'):
print('改f或fe为v加es')
elif n.endswith('fe'):
print('改f或fe为v加es')
elif n.endswith('y'):
print('改y为i加es')
else:
print(n+'s')
print('请输入一个英文名词的单数形式：')
n=str(input())
plural(n)