You will see that not a day passes in which he does not find something or other to mkae him happy, though he may be in tears the next moment.
老师这句话最后中的in which是修饰day吗,为什么用in不应该用on吗,这句话会不会修饰语太长了,主体部分表达不了主要意思?
正因为从句比较长,才置后。但本结构中,即使从句很短,也置后,相当于大家习惯这么说了。
Not a day passes that (in which) he doesn't cry.
用that更简洁。不用on which,on加日期是具体哪一天,不是结构要表达的everyday概念