盘旋之翼
幼苗
共回答了14个问题采纳率:85.7% 举报
如果从句中出现不完整句子就可能是省略句,省略的主语和be 动词.
Although tired ,he kept on working .= Although he was tired ,he kept on working
Be careful while crossing the road.= Be careful while you are crossing the road
Once published ,the book will be popular.= Once it is published ,the book will be popular.
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盘旋之翼
主句和从句主语保持一致时,另外句中要含有be 动词 (系动词或助动词be )时,从句的主语和be 动词要同时省略,省略就是为了句子简洁。