It is a fun day.(改为感叹句),请解释一下为什么这样改?还有一种改为感叹句的句子是什么样的?

It's a fun day改为感叹句 It is a nice day.(改为感叹句) 改为感叹句 It is a lovely day. A picnic is fun.改为感叹句 将It is a nice day today.改为两个以How和What提问的感叹句. It is fine day today(改为感叹句) It is a fine day today.（改为感叹句） It is a very hot day.(改为感叹句） it is a fine day today.改为感叹句 it is a wet day today改为感叹句 It is a very boing thing 改为感叹句怎么改 It's a sunny day 改为感叹句