start to do和start doing有什么区别这两个句型有没有什么区别

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我也不是特别清楚.给个解释很清楚滴~共同学习一下啦
1) 谈及一项长期活动或开始一种习惯时,使用doing.
How old were you when you first started playing the piano?你几岁时开始弹钢琴?
2) begin,start用进行时时,后面动词用不定式to do
I was beginning to get angry.我开始生起气来.
3) 在 begin,start 后接know,understand,realize这类动词时,常用不定式to do
I begin to understand the truth.我开始明白真相.
4) 物作主语时
It began to melt.
一般情况下没区别
只有三种情况只用start to do sth.
1.start本身用-ing
He is just starting to write the letter.
2.主语是物不是人
The ice started to melt.
3.其后的动词与想法\感情有关
She started to understand it.
======以下答案可供参考======
供参考答案1:
1) 谈及一项长期活动或开始一种习惯时，使用doing.
How old were you when you first started playing the piano? 你几岁时开始弹钢琴？
2) begin, start用进行时时，后面动词用不定式to do
I was beginning to get angry。 我开始生起气来。
3) 在 begin, start 后接know, understand, realize这类动词时，常用不定式to do
I begin to understand the truth。 我开始明白真相。
4) 物作主语时
It began to melt.
一般情况下没区别
只有三种情况只用start to do sth.
1.start本身用-ing
He is just starting to write the letter.
2.主语是物不是人
The ice started to melt.
3.其后的动词与想法\感情有关
She started to understand it.
参考资料：https://zhidao.baidu./question/294444896.html供参考答案2:
一般情况下，两者可以互换。如：
He started learning /to learn English when he was only three.
他在只有三岁的时候就开始学习英语了。
但在下列三种情况下，只能用start to do sth.
(1)当主语是物而不是人时。
如：The ice started to melt. 冰开始融化。 （2）当start用于进行时态时。如:She is starting to cook the dinner. 她开始做饭（3）当start后面的非谓语动词指心理状态或精神活动（即表示想法、 意见等的词，如think, realize, wonder, understand等）时。如：She started to wonder who had done it. 她开始想是谁做了这件事。供参考答案3:start+名词（例如：start work，start an experiment）/开始做什么。没有start