Question

punctuate the following now can you please tell me what you just heard he said

Answer 1

"Now, can you please tell me what you just heard" he said.

Answer 2

"Now, can you please tell me what you just heard?" he said.

Punctuation is used to organize a sentence additionally to create more clear sense and stress in a sentence.

The above sentence is quoted as it is a direct statement. Further, the beginning letter of a sentence is always capitalized and question mark is inserted at the end of the interrogative sentence and before the closing quotation mark.