" "Do you think" doesn't take an indirect question as a complement, so you can't have the sentence above. "that" is understood if it is omitted. " CJ
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Paul Evdokimov"Do you think IF/WHETHER they speak French?""Do you think" doesn't take an indirect question as a complement, so you can't have the sentence above.
Paul EvdokimovWhat makes 'think' so different compared to 'know"?Interesting question. I suppose it's because you can know the answer to a question, but you can't think the answer to a question; you can only think a thought, and a thought has a content that is like a statement, so "think" goes with "say" more than with "know".