1)He is late again today.I'll see to it that he will not be late tomorrow.
这late是形容词,用作is的表语,不是被动语态.
today能放在句首!
2)There are more than ten serious casualties in the Monday plane crash.
这plane crash直接加在Monday后面,是因为Monday名词用作定语,修饰plane crash
名词可以用作定语,如：a school bag