Someone walking ahead of you keeps the door open for you.改为同义句

there is someone walking behind you? walking walking walking I was walking in the street when someone called me对was walking in the street提问 英语翻译歌词：Lying in my bed I hear the clock tick,And think of you Caught up in circles confusion Is nothing new Flashback warm nights Almost left behind Suitcases of memories,Time after time Sometimes you picture me I'm walking too far ahea Up ahead my son-in-law to be was beaming是什么意思啊是在这段里面的：Walking your daughter down the aisle toward what you perceive to be is the wrong guy for her is a horrible feeling.I looked over at her face and she was beaming.Up ahea hit,when,walking,someone,I,a,tree,was(连词成句）速度一点,谢谢了 someone is walking ahead of you keeps the door open for you是什么意思 Someone walking ahead of you keeps the door open for you.改为同义句 When someone walking ahead of you keeps the door open for you , when someone ___ahead of you opens the door for you.A walks B walking C is walking 选哪个为什么谢 someone I was walking in the street when I heard someone shouting for help.中someone 后面为什么不加was啊?不是正在的意思么? One day while I ____ along the street,I ____ someone calling.A.walked…was hearing B.was walking…has heard C.was walking…had heard D.was walking…heard为什么选D不选C He heard someone ( ) help when he was walking along the river.中()中填call还是calling? when someone walking ahead of you keeps the door open for you 为什使用walking而不是walks呢?这个句子后是逗号了 我还是不懂呢 I was walking in the street when someone called me与some one called me when I walking in the street这两个句子可以互相转换吗?如果不可以,为什么不可以?