He has made a wonderful discovery I think is of great importance to science.
Is it correct?
Thank you,
He has made a wonderful discovery [ I think ___ is of great importance to science ]. Yes, it is fine. You can omit "that" or the relativised element, since the latter is subject of the embedded is clause, not subject of the relative clause itself.
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He has made a wonderful discovery [I think ___ is of great importance to science].
Yes, it is fine. You can omit "that" or the relativised element, since the latter is subject of the embedded is clause, not subject of the relative clause itself.
zuotengdazuoHe has made a wonderful discovery I think is of great importance to science.Is it correct?
It sounds ungrammatical (or at least awkward) to my American ear, so I would include "which" or "that", but see BillJ's answer for details.
CJ
By the way, your header is not correct.
Is This Sentence Correct To Omit "Which/That"?