Rishonly A TOEFL book says "In a clause of indirect question, avoid using do,does, or did after the question word". For example, I didn't understand what did he say. -- (Wrong) I didn't understand what he said.
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RishonlyA TOEFL book says "In a clause of indirect question, avoid using do,does, or did after the question word".
For example,
I didn't understand what did he say. -- (Wrong)
I didn't understand what he said. (Correct)
Does the rule imply that the word-do/does/did-shouldn't be used immediately after the question word but can