Start to do 与start doing没有区别!另外,begin to do = begin doing
只是要注意：start和begin加了ing后,其后只能接to do,不能再接ing.
总结如下：
Start to do ＝ start doing （正确） begin to do = begin doing （对）
starting / beginning to do (正确)
starting / beginning doing （错误）