I need your help ... An English exercise
Here it is
When you ____ ( read ) this letter , I _____ ( be ) in the hospital to visit my niece .
I'm waiting for the most appropriate answer

Question

I need your help ... An English exercise
Here it is 
 When you ____ ( read ) this letter , I _____ ( be ) in the hospital to visit my niece . 
  I'm waiting for the most appropriate answer

Answer

Look for someone to correct me. Thanks
When you _read_ this letter , I __will be___ in the hospital to visit my niece .

Answer

Let me try , maybe is :
When you _read_ (read)this letter , I _has been_(be) in the hospital to visit my niece .