especially和specially都有 “尤其,特别”的意思
在形容词前面,一般都用especially
especially还会用在,比如强调某件事,重点突出某种情况……you should take this,especially when it's raining outside.
specially,一般指完成的某件事,或者是为了突出其目的.比如I made this specially for your birthday
extremely没什么特别的,程度副词,类似与very,比very much更very much就是extremely了.
especially,particularly 两个字在用法上是可以互换的