I helped him find his father.为什么find不用过去式?

I helped him find his father.为什么find不用过去式? I helped him to find her Father改为同一句 英语关于help的用法I helped him find his father能用 I helped him to find his father i helped him find his father中的find为什么呢是原型 He was lost and I helped him find his father 中的lost是什么词性 I (s ) a boy crying in the street and helped him find his mother. 英语连词成句 and lost him the nother boy was little his helped I find He was lost ang i helped him find his father 中lost是什么词性 he was lost and i helped him find his father是什么意思 The policeman helped him find his m______ motorbike. i didn't laugh at him.instead ,i helped him 同义句I helped him ____ ____ ____ at him. 连词成句,注意句后标点．helped ,I ,him ,his ,find ,mother_________________________________________?decide ,did ,to ,play ,tennis ,you ,this afternoon_________________________________________. there ---a small boy --in the corner yesterday,and i helped him find his mother.A.was crying B.is cry C.was cries D.is cries I am also be happy that I helped him和I also be happy that I helped him 哪个对? He found a key _______(放在）in the box.I helped him (to find his father) 对括号部分提问_____ _____ _____ _____ him _____ _____? The child ____（迷路）,and we helped him find his parents. he was lost and I helped him find his father为什么helped是过去式,而find是原形he wanted to play basketball yesterday为什么play不加ed一个动词是过去式、为什么后一个动词是原形存在 一个句子中，一个动词是过 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?