It's great fun to play with them.是什么句型?fun是什么词性?能多举几例吗?

great fun 中fun的词性是什么It's Great fun +doing还是to do?这里的fun 为什么词性? I think it's great fun to () them. It's great fun to play with them.是什么句型?fun是什么词性?能多举几例吗? it's great fun是啥意思? It's great fun ____(visit)Disneyland. It's------to swim in the river in summer.A.a great fun B.a great funny C.great fun D.great funn John thinks it’s _____ to talk with you.A.very fun B.great fun应该填哪个? It's great fun to play chess in the park.（改为感叹句） It's great ______ to play with my pet(fun funny) It's ___ great fun to talk with you A.a B.the C./ D.an it is a great fun to do sth.还是it is great fun to do sth it's fun to be It's great ____ (fun) to play with you.应该填WHAT?It's great____to play with you?后添fun还是funny 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 is great fun to do ...It is great fun to do sth还是It is a great fun to do sth? it's great fun to sing and dance改为祈使句 ___ ___ ___it is to sing and dance! It's great fun _______(chat) with each other. 英语改错 “It's a great fun working with him”