第1个回答 推荐于2016-04-29
A.一般可互换
只是用v-ing 形式时,动作稳定些,持久一些
B 下面3种情况一般用不定式,少用v-ing
1.主语是物
The water started to boil.
2.start 用于进行时态时
She is starting to do her homework.
3.后面的宾语为表示心理活动的词时(如:see,wonder,realize,puzzle,undersatand...)
I started to wonder why he was there.本回答被提问者和网友采纳