独立主格结构
Because he was invited by the wolf, the rabbit decided to go to the party. 因为兔子被狼邀请了，所以兔子决定去参加聚会。
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Invited(过去分词) by the wolf, the rabbit decided to go to the party. 因为兔子被狼邀请了，所以兔子决定去参加聚会。
Because the wolf(原因状语从句) invited him, the rabbit(主句) decided to go to the party. 因为狼邀请了兔子，所以兔子决定去参加聚会了。
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The wolf(逻辑主语) inviting(现在分词作原因) him, the rabbit decided to go to the party. 因为狼邀请了兔子，所以兔子决定去参加聚会了。
If(引导条件状语从句) the weather permits, the rabbit will go out. 如果天气允许，兔子就会出门。
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The weather permitting, the rabbit will go out. 如果天气允许，兔子就会出门。
After(引导时间状语从句) the work was finished, the rabbit went home. 工作完成后，兔子回家了。
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The work finished,the rabbit went home. 工作完成后，兔子回家了。
The rabbit is lying in bed and a carrot is still held in his hand.
The rabbit is lying in bed, a carrot still held in his hand.
独立主格分类：
- 名词 + 现在分词 （如："the wolf inviting him"）
- 名词 + 过去分词 （如："a carrot held in the hand"）
- 名词 + 动词不定式
The rabbit(名词) to come(动词不定式), the wolf is overjoyed.
兔子要来， 狼乐翻天。
- 名词 + 名词
Many animals went to the party, some(名词/不定代词) of them rabbits and wolves(名词).
许多动物去了聚会， 它们中的一些是兔子和狼。
名词 + 形容词
Many animals went to the party,some(名词/不定代词) of them happy(形容词).
许多动物去了聚会， 它们中的一些很开心。
- 名词 + 副词
The rabbit sat on a chair, head(名词) down(副词).
兔子坐在一张椅子上，头垂着。
名词 + 介词短语
The rabbit came in, carrot(名词) in hand(介词短语).
兔子进来了，手里拿着胡萝卜。
- 。。。
名词 + being + ...
Many animals went to the party, some of them being rabbits and wolves.
许多动物去了聚会，它们中的一些是兔子和狼。
Many animals went to the party, some of them being happy.
许多动物去了聚会，它们中的一些很开心。
The rabbit sat on a chair, head being down.
兔子坐在一张椅子上，头垂着。
The rabbit came in, carrot being in hand.
兔子进来了，手里拿着胡萝卜。
独立主格结构 -------->非谓语动词
- 过去分词 （“被动” / “完成”）
- 现在分词 （“主动” / “进行”）
- 不定式 （“将要”）
