比如pens做先行语,后加定语从句,是that is 还是that are 或是别的?

比如pens做先行语,后加定语从句,是that is 还是that are 或是别的?
比如pens做先行语,后加定语从句,是that is 还是that are 或是别的?

比如pens做先行语,后加定语从句,是that is 还是that are 或是别的?
Here are pens that are to be given to children.当然是根据先行词的单复数了.

应该用 that are
that在这里是个关系代词 在从句中指代pens 并不体现单复数
that 后的动词则体现了先行词的数量和句子的时态
如果句子要求用一般现在时 pens 是复数 要用are

that are