[文法] 少了連接詞的兩個進行式動作
大家好，我在讀英文課本有個地方看不懂。
課文中有一個句子He was walking toward me, flipping a coin.
我很好奇為甚麼這一句的逗號後面少了一個連接詞and？
照理來說連接兩個進行式動作，不是應該要有連接詞and嗎？
單單只有逗號並不能取代連接詞and的功能吧？
而且這一句應該也不是分詞構句，如果是分詞構句的話，句構應該是
Flipping a coin, he was walking toward me.
還原的話就是When he flipped a coin, he was walking toward me.
因為兩個子句主詞相同，
所以可以把句首表示時間的連接詞When刪掉，
再把第一個子句重複的主詞he刪掉，
主動發出的動作flipped簡化成現在分詞flipping，
所以整句簡化為Flipping a coin, he was walking toward me。
但是課文裡這個句子不是這樣。
倘若這句是分詞構句，還原就變成
He was walking toward me, when he flipped a coin.
可是When的前面不可以擺一個逗號吧？
有沒有好心人能幫我解答為甚麼這句的逗號後面沒有連接詞and？
拜託了Orz
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