it is great fun后应加什么时态

it is great fun后应加什么时态 It is great fun啥意思? 为什么是what great fun it is!而不是what a great fun it is! it is a great fun to do sth.还是it is great fun to do sth 英语的fun可数吗?是What a great fun it is!还是What great fun it is! It is great fun to do ...It is great fun to do sth还是It is a great fun to do sth? fun 是什么词性It is gueat fun 中great fun 可以用interesting代替吗 what great fun it is+to do sth 吗 it is great fun +doing还是to do It is great fun playing with him分析 It is great fun to make ------------(snowman 或snowmen) I think it is a great fun.改错) It is great fun ___(play)the piano . what great fun it is ____ (sit )on the balcony fun 可数吗,What.a great fun it is .正确吗 It was great fun!还是：it sounds great fun? it+was+great+fun是什么意思 It was great fun.感叹句