问题描述：
do 和 to do ,doing ,to doing 他们之间的区别与联系.很晕啊
问题解答：
我来补答
(1) do sth (这个结构一般是以下几种情况）
ONE:情态动词 +动词原形
She can speak six foreign languages
TWO :助动词+动词原形
We will go to Beijing tomorrow
THREE:不带TO 的动词不定式做宾语补足语
His mother made the boy clean the room
(2) to do (这个结构一般是以下几种情况）
ONE:动词不定式做宾语
He wants to become a scientist
TWO :动词不定式做宾语补足语
The teacher asked all the students to finish the examination in one hour
THREE:动词不定式做主语补足语
The thief was seen to go into this supermarket
(3) doing sth (这个结构一般是以下几种情况）
ONE:动名词做宾语
They finished building this house three days ago
TWO :动名词做宾语补足语
We saw one thief stealing from one old man's wallet
THREE:动名词做主语补足语
This thief was seen stealing from one young lady's wallet on a crowded bus
(4) to doing (这个结构一般是以下几种情况）（注意：前面TO 是介词标志,需要接名词或者动名词）
ONE:介词+动名词结构
The girl is not used to living in a strange environment
We are looking forward to seeing you again
