Question

小问题，悬赏20分了！

Whichever of the fitness classes you opt for, trained instructors are there to help you
Whichever of 如何转换成
例如这个对不对？
Whichever of you comes first will receive a prize.
【any one of you that comes first will receive a prize.】
【【我自己归纳的
whoever=anyone that/who
whatever=anything that
whichever=any that
【any one of you that comes first will receive a prize.】好像又是错的

因为whoever=anyone that/who？？
Which of them come from canada?他们中谁来自加拿大？
Which of them is your headteacher?他们中那位是你们的校长？
谓语动词单复数不一样？？

Answer 1

1. Whichever of the fitness classes you opt for, trained instructors are there to help you.
此whichever引导的不是名词性从句，所以不能用类似于whoever = anybody who 和 whatever = anything that的变化来进行转换。
它引导的是让步状语从句，所以只能换成：
whichever = no matter which，其他就照抄了。

2. 如果引导的是名词性从句，才能按照楼主的那种变化形式。
Whichever of you comes first will receive a prize.
这个就是主语从句（属于名词性从句），所以不换成“no matter + wh-”。
个人认为可以这样转换：
Whichever of you comes first = Any (one) of you who come first
whichever既可指sb，又可指sth，所以不一定换成Anybody，而anyone/anybody后面又不能加of

3. 第一句不对，应该还是：Which of them comes from Canada?
Which of them is your headteacher? 此句无误。

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追问

【1】第一句不对，应该还是：Which of them comes from Canada?真的吗？？？
柯林斯高阶英汉词典 里的
QUEST（用于疑问句中）哪个，哪些
Which are the ones you really like?...哪些是你们真正喜欢的？

Which vitamin supplements are good value?
哪种维生素补充片好？

【2】whichever既可指sb，又可指sth是啥意思呢！？？

追答

1. 关键是句中的which的句意是“哪些”还是“哪个”。
这样说来，两种说法都是正确的。
Which of them come/comes from Canada?
他们中的哪些人/哪个人来自加拿大？

2. whichever既可指“某些人中的任何人”即指sb，也可指“某些事物中的任何事物”即指sth.