两个英语句子的成分问题

which 指代 之一 (物)
that 唯一,所有 is there anything that i can do for you?
as 显见
这个题 food 帮助我们活下来 as指代 食物 表显见的.你自己揣摩下He gave me a hug which caught me cold.请问这个which caught me cold是个什么从句，判断依据是什么？还有就是 is there anything that i can do for you?中的that可否省去？还是不太明白为什么要用as，请问您可不可以稍微详细一点？that和which不能指代food么？谢谢！定语从句哦翻译成中文从句是修饰hug的所以是定语从句你翻看看 .is there anything that i can do for you 中,that是不可省的,它作do 的 宾语.that 和 which 当然 可以 指代food, 但 在你写的这句话的语境中 应该用 as 去指带 前文 的 food 举例is there any food that i can have to eat.这句中就不能用 as指带food而 是用 that can you bring me some food which has sugar in it. 这里 就要用 which而不用 as or that懂了吗?虽然都是作主语, 但as, that , which 是有区别的 . 嘻嘻 记得采纳哦