以ff结尾的单词怎么变复数
比如
cuff — cuffs 袖口；
cliff —cliffs 悬崖；
buff — buffs 爱好者;
eg
The cuffs of his shirt were fraying.
The cliffs rise sheer from the beach.
以单一的f结尾或者以fe结尾的名词的复数形式确实比较复杂，因为它们总共分为三个类型
去f/fe，变成ves，比如knife — knives;
去f/fe变成ves，或者直接加s，比如scarf — scarves/scarfs;
直接加s，比如roof — roofs;
具体属于哪种类型没有规律，要逐个去记