为什么leading a happy life前要加be动词?如：I am leading a happy life.

为什么leading a happy life前要加be动词?如：I am leading a happy life. we are leading a happy life 为什么用a ___ the past and you will see a happy life we are leading now.A.Think ofC.Think about选哪个?为什么? When I was a girl,in the deserts of Somalia,my family was nomadic,_______with our animals,and leading a happy life.A.working hard B.living together C.looking after D.moving around这题选D 为什么? play a leading With a girl leading the way,he started towards the house.为什么用leading而不用led? l have a happy family. 是什么意思? l love you a happy day leading leading he says that he is leading a meaningful life makes him happy?这个句子对吗?其中that he is leading a meaningful life 是宾语从句中的主语从句,says 后面省掉了that,这样理解行否? The villagers built a roard leading to the city .为什么填leading啊,这条路又不是自己通向的,要人为啊,为什么不填leaded?呢 play a leading role in还是play leading role l hope your family andyou have a happy holiday!lra cherish what we have , enjoy a happy l求高手 we are l---a rich and happy life l feel happy that l am a fish b__ l love swimming so much a sense of happiness.为什么不用happy