I've already learnt that if we want to make a sentence sound like imperative, there is no subject needed as in
1.Go see if she is okay!
2.Tell me if she is okay!
But is it possible to include "you" or "he" to make the sentences sound like imperative as in
3.You/he go see if she is okay!
4.You/he tell me if she is okay!
If my examples are not good for answering my question, you can make other sentences appropriate for this question.