do 和 to do ,doing ,to doing 他們之間的區別與聯繫.很暈啊

題目：

do 和 to do ,doing ,to doing 他們之間的區別與聯繫.很暈啊

解答：

(1) do sth (這個結構一般是以下幾種情況）
ONE:情態動詞 +動詞原形
She can speak six foreign languages
TWO :助動詞+動詞原形
We will go to Beijing tomorrow
THREE:不帶TO 的動詞不定式做賓語補足語
His mother made the boy clean the room
(2) to do (這個結構一般是以下幾種情況）
ONE:動詞不定式做賓語
He wants to become a scientist
TWO :動詞不定式做賓語補足語
The teacher asked all the students to finish the examination in one hour
THREE:動詞不定式做主語補足語
The thief was seen to go into this supermarket
(3) doing sth (這個結構一般是以下幾種情況）
ONE:動名詞做賓語
They finished building this house three days ago
TWO :動名詞做賓語補足語
We saw one thief stealing from one old man's wallet
THREE:動名詞做主語補足語
This thief was seen stealing from one young lady's wallet on a crowded bus
(4) to doing (這個結構一般是以下幾種情況）（注意：前面TO 是介詞標誌,需要接名詞或者動名詞）
ONE:介詞+動名詞結構
The girl is not used to living in a strange environment
We are looking forward to seeing you again