Mouth Shapes for Speech

If i was making a fully working head which to be used for speech i would need to make sure that all the shapes required for speech are made. I have been looking into the shapes the mouth makes when making particular sounds or words.

The image here shows the main expressions used for speech.

I had originally planned to make all of these. However through making just a few so far i have learnt that each shape can be very time consuming.  However it will be of good reference for the future, should i ever need a talking character. The ones shown here are very cartoony and show lots of deformation on the characters face shape. The character head i am currently using would not really allow for this nor would it suit the style.