首先,at the first time when 是肯定不对的,这里不需要at 介词,at the first time 不可接任何从句.例子 we should correct the teacher's mistakes at the first time.at the first time 跟every day,等都是要放到句尾或句首的.
这里when 要省略,否则句子显重复.例子,we should correct the teacher the first time when he makes mistakes.这两个句子的意思都一样,你的,明白?