之前才跟學生提醒不要只用被動主動判斷加ving 還是pp 例如She rode thw bike with her hair blowing. 要想到是 Her hair blows. 是主 動語態，不要覺得 頭髮是被風吹的而寫blown 但是! 剛剛有句覺得有疑問 She sings with her hands waving. 後面似乎不能還原成Her hands wave. 因為幾乎不會這樣說，而是說Someone waves hands. 如此,我要怎麼解釋如何判斷用ving/pp呢? 謝謝!!