in the beginning “開始時”,直接用作時間狀語,不接of
at the beginning (of) “在……開始時”,后面必須接of,如at the begining of the class
from the beginning “從一開始就……”強(qiáng)調(diào)持續(xù)
to begin with只能用在一句話的開頭,表示首先要講什么,例如：To begin with,i want to extend my thanks to my parents. 首先,我想感謝我的父母.