IMO, #1 means a). The others are different ways of expressing meaning b).

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1-It is a crime for our boss to show up late for work.
2-To show up late for work is a crime for our boss.
3-For our boss, to show up late for work is a crime.
4-For our boss, showing up late for work is a crime.
5-For our boss, it is a crime to show up late for work.
Can't all these sentences have two meanings:
a-It would be a crime on the part of our boss if he shows up late for work
b-Our boss considers showing up late for work a crime
Gratefully,
Navi.
IMO, #1 means a). The others are different ways of expressing meaning b).
Please be aware that I'm neither a native English speaker nor a teacher.
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