15.5 主语补足语
含有复合宾语的句子，当采用被动语态时，原来的宾语变成主语，原来的宾语补足语则因此变为主语补足语。试对比下面句子。
We call him Jason. (名词作宾语补足语) 我们叫他贾森。
He is called Jason. (名词作主语补足语）他叫贾森。
We must keep these products dry. (形容词作宾语补足语) 我们必顺保持产品干燥。
These products must be kept dry. （形容词作主语补足语）这些产品必顺保持干燥。
He turned the light off. (副词作宾语补足语) 他关掉了灯。
The light was turned off. (副词作主语补足语) 灯关了。
I saw him playing basketball yesterday. （现在分词作宾语补足语）我昨天看见他正在打蓝球。
He was seen playing basketball yesterday. （现在分词作主语补足语）昨天看见他正在打蓝球。
He instructed us to wait here. （不定式作宾语补足语）他指示我们在这儿等。
We are instructed to wait here. （不定式作主语补足语）我们得到指示在这儿等。
We should keep the cards in good order. （介词短语作宾语补足语）我们应该保持卡片排好序。
The cards should be kept in good order. （介词短语作主语补足语）卡片必顺排好序。
