摘要：2．如不能和句子中的主语保持一致.该-ing形式必须有自己的逻辑主语.通常有名词或代词来担任. The last bus having gone, we had to walk home. 末班车已经开走了.我们不得不走回家.(having gone的逻辑主语是the last bus.而不是we) Time permitting, the football match will be played on Friday. 天气允许的话.足球赛将在周五举行.(permitting的逻辑主语是time.而不是the football match) 注意: 高中阶段有一些固定的-ing形式短语.如generally speaking, judging from..., considering..., talking of..., supposing...等.它们的逻辑主语可以和句子的主语不一致.这种-ing短语可当作一个插入语. Generally speaking, boys are more interested in science than girls. 一般说来.男孩比女孩对科学更感兴趣. Judging from his accent, he must come from Canada. 从他的口音看.他一定来自加拿大. Considering how poor he was, we decided to let him attend the concert for free. 考虑到他是多么的穷.我们决定让他免费听音乐会. Supposing it rains what will you do 假使下雨.你会怎么办呢?

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