大学英语：First， there are those words with which we become

　　2. First， there are those words with which we become familiar in ordinary conversation， which we learn， that is to say， from the members of our own family and from our friends， and which we should know and use even if we could not read or write.

　　句子中which引导的都是定语从句，修饰中心词words.第一个which的前面有介词with， 这儿的with是familiar with中的介词前置了。Familiar with 意为“熟悉”。如：Are you familiar with the man standing over there?(站在那边的那个人你熟悉吗?)

　　请注意familiar with 与familiar to 的区别，familiar with 的主语通常是人，而familiar to的主语通常是物。如：

　　1)I am not familiar with this place.

　　2) This place is mot familiar to me.

　　that is to say 是插入语，其作用是对整个一句话进行解释，类似的插入语还有so to speak， if I may say so， if you don't mind等等，如：

　　1)I'd really rather not go， if you don't mind 我确实不想去，你如果不介意的话。

　　2) The new emperor was， so to speak， a puppet.新皇帝可以说是个傀儡。