Watch and listen to how this person speaks. Take note of the sounds you hear when their mouth moves a specific way.
Echo cancellation:
Repeat the word/phrase you just heard while looking at the camera. Make sure you copy every mouth movement. Press the record button to review what you said later.
Press the play button to watch and listen to what you said. Does it sound like the example in step one? If not, try practicing this word/phrase again!