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Should I say 

 "these functions are strictly non-decreasing, whereas the others ARE.", 
 - or - 
 "these functions are strictly non-decreasing, whereas the others DO." ?

Related, but not similar: 

 "these kids in the video are clearly not playing, whereas the others ARE.", 
 - or - 
 "these kids in the video are clearly not playing, whereas the others DO."

Which is correct in each example, and what is the difference?

Thanks!

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  • The first two examples are ungrammatical. A reduction too far. I couldn't rate (3) as ungrammatical, but it's clumsy. I wouldn't accept (4).
    – Edwin Ashworth
    Jun 2, 2020 at 14:32
  • The point being, @user16etc, that the verbs need to match; are doesn't go with do. In the first examples, you have are...whereas...are, which won't do because whereas must introduce a contrast and you need "whereas...are not" -- and that is awkward because of the negative introduced in non-decreasing.
    – Andrew Leach ♦
    Jun 2, 2020 at 15:08
  • 2
    "These functions are non-decreasing, whereas the others are" seems bad, but "These functions are not decreasing, whereas the others are" seems OK.
    – GEdgar
    Jun 2, 2020 at 15:58
  • 1
    I'll add that in the first sentence, it should be whereas the others AREN'T [strictly non-decreasing]. If you use whereas in this way, what follows should be the opposite of what came before.
    – Jason Bassford
    Jun 2, 2020 at 20:37
  • 1
    You need to match auxiliary verbs: These kids in the video clearly aren't playing, whereas the others are; these kids in the video don't play fair, whereas the others do; these kids in the video clearly can't play quietly, whereas the others can.
    – Peter Shor
    Jun 4, 2020 at 11:43

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