see＋宾语＋宾语补足语:
When Zhou Kai's mother saw towards the front door without a jacket on， she eyed him anxiously.
周凯的妈妈看到他没有穿夹克衫就往前门走去时，她担心地盯着周凯。
句中saw him heading为“see＋宾语＋宾语补足语”结构。
又如:
If you watch long enough， you will see many problems settled in this way
其它用法:
(1)see sb. do sth.“看见某人做了某事”，强调动作的全过程
(2)see sb. doing sth.
“看见某人正在做某事”，强调动作正在进行
(3)see sth. done“看见某事被做”，强调动作
相关例句:
We made him happy. 形容词happy作【宾语补足语】，说明宾语怎么样。
They elected Lucy their monitor. 名词词组their monitor作【宾语补足语】，说明宾语是什么。
He keeps his room clean. 形容词clean作【宾语补足语】，说明宾语怎么样
我的理解是将前半部分和后半部分拿出来，加上相应的系动词，再读一遍，意思无矛盾就是宾补，反之就是双宾： He told me a story
=> I am a story. X => 双宾语 We see him speak English
=> He is speaking English. O =>宾补 一般来说 give sb. bring sb. take sb. 这种形式基本都是双宾语 本质而言双宾语就是两个宾语之间没有关系逻辑上的主谓关系，宾语补足语是宾语同其补足语之间存在逻辑关系。
