8. Speechreading classes usually start off with the easiest sounds to see on the lips, and the clearest and most obvious is probably this one:
The lips meet, and then part slightly.
What sound are we making here?
From Quiz Read My Lips!
Answer:
All three of these
While this movement is very easy to see, it can present some problems, as the three sounds are almost identical. If you watch yourself making these sounds in the mirror, and look very carefully, you might see small differences, but these differences disappear in a real-life situation where you are watching other people speak.
Thus "meat", "beat", and "peat" will look the same in speech, as will "mat", "bat" and "pat". You'll need to use context to tell them apart.