The basic sentence is the statement form: < you think (that) he came to France when > To form a question, the question word must be moved to the beginning. < when you think (that) he came to France ? > The first subject-verb combination now must be transformed thus: < you think > --> < you do think > --> < do you think > Giving: When do you think he came to France?
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DitchSo in When do you think he came to France, when functions as an interrogative, but do does not? And in Do you think when he came to France, he had fun?, do functions as an interrogative but when does not? Correct?Generally speaking, yes, that's correct.