关于定语从句A larva is an insect at the stage of its life after it

不是,定语从句一定是有修饰的词语的,一般放在引导词的前面例如：The package (which / that) you are carrying is about to come unwrapped.(which / that) you are carrying就是修饰The package,翻译的时候就是你拿的包,或者做状语：Beijing is the place where (in which) I was born.北京是我的出生地.你这句话的话就是after和before做连词的情况,after和before不会引导定语从句.这句话的翻译就是：幼虫是昆虫在它从卵孵化以后在其变成成虫之前的形态.