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Guest Posted 21 years ago
Grammar

Verb

These methodologies, that, in principle, are valid only for excited states dominated by singly excited configurations (or when the linear response theory is valid) is currently under intensive testing. "is currently under intensive testing" does it make sense or some verb missing, please advise.
  

Top answer

It should read ' are currently under intensive testing'.

  • It should read ' are currently under intensive testing'.
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4 Answers
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It should read 'are currently under intensive testing'.
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Shouldn't there be a comma before are ?
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No, there shouldn't be a comma before "are". In fact, the comma after "methodologies" should be omitted.

These methodologies that, in principle, are valid only for excited states dominated by singly excited configurations (or when the linear response theory is valid) are currently under intensive testing.
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Hello!
As the sentence is rather long and complicated, I thought the reading and undersatnding would be easier as follows:
These methodologies, that, in principle, are valid only for excited states dominated by singly excited configurations (or when the linear response theory is valid), are currently under intensive testing.

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