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I have following construction. I have been told it is not grammatical.

But now, another problem might arise due to unknown unavailable edges, i.e. A-B and C-D and should be avoided.

I am not quite sure what the error is. But I guess, in the second sentence "it" is missing.

so, if I write like this, would it be OK?

But now, another problem might arise due to unknown unavailable edges, i.e. A-B and C-D, so that it should be avoided.

Please tell me how it should be, then I can think and learn.

  • Are you trying to avoid the problem or the unavailable edges? I can't tell in this context. It would be a difference of using "it" or "they". Or you could specify it in the last clause to make it clear. – user485 Apr 7 '13 at 18:10
  • @user3169 The and requires that the parsing is problem ... should be avoided because and coordinates, and should can only be coordinated with the other finite verb in the sentence: might. – StoneyB on hiatus Apr 7 '13 at 18:59
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I would rather write the sentence as follows:

But now another problem might arise due to unknown unavailable edges, i.e. A-B and C-D, and should be avoided.

"And should be avoided" is referred to "another problem." You could also write the sentence as follows, but the sentence I wrote before would be understood too.

But now another problem might arise due to unknown unavailable edges, i.e. A-B and C-D, and it should be avoided.

Instead of introducing the parenthetical with commas, you can use parenthesis.

But now another problem might arise due to unknown unavailable edges (i.e. A-B and C-D) and it should be avoided.

2

The punctuation is wonky, and the sentence could be made a little clearer, but it is not "ungrammatical". Here are some possibilities:

But another problem might now arise (due to edges A-B and C-D being unknown and/or unavailable) and should be avoided.

Another problem, which should be avoided, will arise if edges A-B and C-D are unknown and/or unavailable.

If edges A-B and C-D are unknown and/or unavailable, another problem may now arise and should be avoided.

Edges A-B and C-D being unknown and/or unavailable may now give rise to another problem, which should be avoided.

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