all of them,none of them...all of them is还是are?none of them is还是are?再问一下breakfast.lunch.dinner.supper都是可数的还是不可数的?什么时候要加冠词?

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all of them,none of them...all of them is还是are?none of them is还是are?再问一下breakfast.lunch.dinner.supper都是可数的还是不可数的?什么时候要加冠词?

all of them,none of them...all of them is还是are?none of them is还是are?再问一下breakfast.lunch.dinner.supper都是可数的还是不可数的?什么时候要加冠词?
all of them,none of them...
all of them is还是are?
none of them is还是are?
再问一下breakfast.lunch.dinner.supper都是可数的还是不可数的?什么时候要加冠词?

all of them,none of them...all of them is还是are?none of them is还是are?再问一下breakfast.lunch.dinner.supper都是可数的还是不可数的?什么时候要加冠词?
第一个 are
第二个 is
都不可数

all of them are
none of them is

之所以第一个 are 第二个 is 的原因是,none并非all的否定形式。逻辑学上“全都是(all)”的否定是“不全是not all”,而不是“全都不是none”,这就造成了are 和is的差异。
all的否定形式是not all,此事确实应该用not all...are。