1.Lead into：引起(某件事情的发生)eg：The conflict leads into a war.冲突引起了战争2.Lead in to： 是把什么引进来 eg：lead my brother in to the house. 把我弟弟引进房里来

一.lead to的用法1. 通到This road leads to the hotel.这条路通到旅馆。2. 导致Smoking can lead to lung cancer.抽烟可能导致肺癌。二.lead in的用法1. 引进The usher led the guests in.招待员把客人引领进来。三.lead into 的用法1. 通向;导致This gate leads into the courtyard.这门通向院子。