题目内容：

begin to do= start to do,start doing =start to do

优质解答

可以这样子说.begin和start同义,可以互换,后面跟to do和doing差别也不大.但在有些情况,通常用to do.如：①进行时态中：be beginning to do.The water is beginning to boil.水开始沸腾起来了.②物作主语：sth begins...