Maybe pause liveatc and pretend you are the pilot responding to the controller.
Then after you have responded, unpause the playback and check if your response was correct.
It probably helps to pull up FR24 or planefinder as well and enable callsign labels so you know the positions and orientation of the plane.
Maybe even give yourself a fake needle to "select" your heading and something to select your altitude.
Writing it down when you are finished answering should also be sufficient.
Only listening indeed is insufficient, but actually answering the calls will help with phraseology.