i18n 关于连词的问题(and,和)

模版:
cn_singular = {{subject}} 是好学生!
cn_plural = {{subject}} 是好学生!

en_singular = {{subject}} is a good student!
en_plural = {{subject}} are good students!


len(subject) == 1:
A 是好学生
A is a good student

len(subject) == 2:
A和B是好学生
A and B are good students

len(subject) >= 3:
A,B和C是好学生
A, B, and C are good students

1. 单复数一般怎么处理？(singular template + plural template 是办法么？)
2. 连词如何处理？（如下方法可行么？) 英文大于3个subject时“,”和“and”怎么处理？

en_US
conjunction = and

zh_CN
conjunction = 和