YET: don't know + WH Clauses

WH-CLAUSES

don't know

SUBJECT + don't know + (how, who, what, where, when, which) + pronoun ​+ verb

PROBLEM:

  • I don't know where is he.  INCORRECT
  • I don't know where he is?    CORRECT
EXAMPLES: 
  1. I don't know why he took Delta to Dallas.   Southwestern is cheaper.

  2. I don't know why she sold her house.  (LISTEN)

  3. He doesn't know when he will be transferred to Hong Kong.
    ​
  4. I don't know why he moved to Vancouver. 

  5. She doesn't know why he was late to class.

  6. Who did she go to the marketing meeting with?  
    I don't know who she went with.

  7. Does she know when they will arrive?  
    No she doesn't know when they will arrive.    
SUBJECT + don't know + (how, who, what, where, when, which) + pronoun ​+ verb