all day=all day long 作副詞，修飾rain
It will rain all day long and it will be humid.
下一整天的雨
Sitting outside the hospital on that bench. All day long, every--
一整天坐在醫院外的長凳--
The boat won't get finished with me nattering all day.
這船無法完工，如果我嘮叨個沒完．
all the day=(the whole day) 作spend的受詞
You can spend the whole day swimming at the pond.
你可以一整天在池塘裡游泳
We have to spend the whole day walking home.
我們必須花一整天的時間走路回家
all the time 一直，總是
I want to wear it all the time.
我要一直穿著它