保险的说法是换一种表达:He is out of the school for a whole day. 楼上的大哥们的not + all day的都只是“不是全天在学校”的意思,并非“一整天都不在学校”的意思。英文的否定一定要小心。
He is not at school all day today.
He is not at school all day.
Today he wasn't at school all day.
He isn't at school all day today
he today all day is not at school