Answer:
"Ya se han ido los niños. He pagado la cuenta. Has hablado con Richard."
Note: Spanish verb conjugation can vary depending on the tense and the subject of the verb, but in this sentence the verbs "ir" (to go), "pagar" (to pay) and "hablar" (to speak) are conjugated using the indicative present tense and the subject "tú" (you).
Explanation: