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 Leading a happy life is to be active. Many people experience 好人帮忙译英语3The second secret to leading a happy life is to be a he says that he is leading a meaningful life makes him happy ___ the past and you will see a happy life we are leading no she is leading a busy life ,与she leading a busy life有什么区别 that of i have been leading a dull life like that of "a frog the leading city和live a …life分别是什么意思? _____with the happy life she is leading,Li Hua,therefore,is I pursue a simple and happy life We live a happy life.