YET: don't know + WH Clauses
CLAUSES

WH-CLAUSESdon't / doesn't know

PROBLEM:

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

  2. I don't know why Susan didn't come to the party.  

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

+ how, who, what, where, when, which
​
+ pronoun​+ verb