3) 以f或fe 结尾的名词变复数时:a. 加s,如: belief――beliefs roof――roofs safe――safes gulf――gulfs;b. 去f,fe 加ves,如:half――halves knife――knives leaf――leaves wolf――wolves wife――wives life――lives thief――thieves;c. 均可,如: handkerchief:handkerchiefs / handkerchieves
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