It's not easy to cross the rive on a ropeway为什么要加to

It's not easy to cross the rive on a ropeway为什么要加to 连词成句 （1）ix,ropeway,on,cross,easy,the,it,not,to,river,a （2）fa He is not _____when he goes on a ropeway to cross the river. 1.To cross the river on a ropeway isn't easy.(写同义句) 2.My hou these students go on a ropeway to cross the river to school go,a,school,to,the,these,on,to,ropeway,students,cross,river连 so these students go on a ropeway to cross the river to scho these students go on a ropeway to cross the river to school翻 .---It’s not easy for people to cross the Changjiang River.- It's easy to make such a mistake.make前为什么要加to The students cross the river on a ropeway 英语翻译（ ）is not easy ( ) ( )the river on a ropeway用这种句式