I helped a lost boy___(find)his mother in the park this morning

I helped a lost boy___(find)his mother in the park this morning He was lost and I helped him find his father 中的lost是什么词性 He was lost ang i helped him find his father 中lost是什么词性 i am a lost He lost his left leg.If I ( )more about going first aid,Icould have helped.A.knew B.have known C.had known D.would know说明原因 I helped Sally buy a new I helped Bob_(买)a new watch. 英语连词成句 and lost him the nother boy was little his helped I find he was lost and i helped him find his father是什么意思 He helped me () my lost book.A found B find C finding I lost a s_______of keys. i am a little lost he helped me___ my lost book.(find) When I lost my job,my mother helped me by ___ me __ some money怎么填? I helped Tom bought a new computer.改错 了 . I HELPED SALLY BUY A NEW WATCH是什么时态 I helped Sally ___(buy)a new watch. the little boy was lost and i helped him（）his father.A finding B find C found D finds答案是b我觉的有helped再有find就两个动词了啊,请高人帮我分析一下4个答案选与不选的原因啊?