the class is beginning为什么要用beginning而不是begin?

the class is beginning为什么要用beginning而不是begin? for the smile is the beginning.beginning为什么加ing A good beginning is half of success 这里的 begin 为什么 要加ing The Beginning Is The End Is The Beginning 歌词 the beginning is the end is the beginning The beginning is a mistake The end is a beginning. the beginning of the beginning is a mistake是什么意思? Begin at the beginning.句中为什么有the?它起到什么作用 in the beginning,to begin with,from the beginning和at the beg This is the beginning of the garden tour.为什么要ing In the beginning at first at the beginning of to begin with