I'm not a native speaker but Iagree with the Englishman who says that No. 2 is a literary equivalent of No. 3.
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CalifJimGroup 2 and 3 (with should) are much less used. These rather literary forms are used mostly in poetry and song lyrics and book titles, for example, but rarely in conversation these days.
CJ
Groups 2 and 3?
sitifan Groups 2 and 3?Yes, also, and probably better. But I was thinking "Group 2 and (Group) 3 ... are ...."
sitifan4a. [none]
If you are to get one million dollars, what will you do?
Is the above sentence possible?
It's not natural at all.