It must be fun to后接什么

It must be fun to后接什么 It must be _____(fun) to climb mountain ( ) great fun it must be to go abroad!这里的fun是名词还是形容词?it must be fun,这个fun好象是形容词, it must be fun to go abroad,(改为感叹句） _____ _____ it must be to go abroad! it must be great fun.great it must be ___ to fly to the moon ___ a spaceship.a.a great fun,byb.great fun,byc.a great fun,ind.great fun,in it's fun to be 英语翻译it might be fun 和it must be it must be teenagers ___ fun.A.have B.having C.had D.to have It must be teenagers having fun 为什么这里要用having而不用to have It must be teenages having fun 这里为什么要用having 而不用to have 连词成句：go ,fishing,must ,with,it,fun,friend,to,be. friend must with it fun fishing to be怎么连词成句 it must be fun ,____ ____?(反义疑问句) It must be _great fun. A a B the C / It must be fun.和It must be funny.的区别为什么fun是名词,却可以这样用 1.That must be more fun than ( )a bus2.It's about an ( )(hour) ride to get there 英语翻译以下如同1.he could be running for exercise.2.he might be running to catch a bus.3.it must be teenagers having fun