the boy seated himself in the corner with his back ___to his backa turning b to turn c to be turned d turned

The mother seated her I found a boy _____at the back of the classroom为什么只能用seated ,而不用siting? The old man _A__ the boy on his knees.A.seated B.was seated C.sat D.was sat请高手为我讲解下为什么不选B呢?麻烦给我讲的详细点,我将感激不尽! the boy seated himself in the corner with his back ___to his backa turning b to turn c to be turned d turned The boy seated himself in the corner with his back()to his father .A turning Bto turn C to be turn D turned Yesterday I saw a man （）in the street ,with a little boy ()on his shoulderAwalking seating Bwalk sat Cwalking seated D to walk seating选哪个 ,理由 有英语问题不懂!help me!1> The boy seating himself was my brother.2> The boy seated was my brother.3> He was surprised to see some villagers seated there.4> To his surprise,hesaw some villagers seating themselves at the back of the classroom. 一道英语从句的选择题 _____,the car stopped all at once .A Seeing a boy lying on the road B On seeing a boy sitting on the road C The minute the driver saw a boy seated on the road D the driver had seen a boy standing on the road 可以分 ____,so he stopped the car at once.A.Seeing a boy lying on the roadB.On seeing a boy sitting on the roadC.The driver had seen a boy standing on the roadD.The minute the driver saw a boy seated on the road选什么,为什么, I found the little boy ( ) A.B.C.D.A.,seated on the ground B.was seating on the groundC.seating on the ground D.sit on the ground the man ____in the chair asked me to ____.a.seated;seated b.sitting;sitting c.seating;seat d.seated; be seated, When I ______, the play started. A. was seated B. seated C. was seating D. was being seated when everyone was seated the meeting began.还有seated the meeting we found the two children seated on the floor------为什么用seated 而不用seating? sitting /(be)seated in sofa ,my dad was watchingsitting /(be)seated in sofa ,my dad was watching TV.Dressed in black,the boy looks very hard some .Faced with the crisis ,the newly-elected president will suffer a hard time.开头第一词都是要问 In front of the house there is a beautiful garden,______owner seated under the tree playing chess with a little boy.A.whose B.which C.of which D.its In front of the house there is a beautiful garden,__owner seated under the tree playing chess with a little boy.A.whose B.which C.of which D. The boy__ on my left is our monitorA.seating B.seated C.sitting D.being sitting [ (B) why?]为什么不是The boy （who is） sitting on my left is our monitor 呢