Say and tellに関してです。
If you say who somebody is talking to, use tell:
TELL SOMEBODY を使用し、SAY
たとえば、Tsuyoshi told me that you were in hospital. (not Tsuyoshi said me)
What did you tell the police? (not say the police)
たとえば、He said goodbye to me and left. (not He said me goodbye)
What did you say to the police?
Tsuyoshi couldn’t help me. He told me to ask Chris.
Tsuyoshi couldn’t help me. He said to ask Chris.