it's a resting day.resting 为什么加ing rest也有名词的意思呀?

it's a resting day.resting 为什么加ing rest也有名词的意思呀? It's a cold day. Today is a s( ) day.It's Mother's Day. It is a r( )fun place to go ,Many people go s( ) there every day Thursday is a busy day in my family ,Sunday is a resting day in my family . It's blowing cool wind.It's a ( ) day it's a ()day .it's quite warm it’s a good day to die It's a sunny day 改为感叹句 It's a beautiful day怎么翻译? Let's call it a day. let's call it a day It's a fun day改为感叹句 翻译:Let's call it a day. it's a lovely day改为感叹句 It’s a unusual day 改病句 It's A Lovely Day 歌词 It's a fine ( ) (date,day) today