And so, here are a collection of different inbetweening tests that you can download and use the register marks to line up the drawings onto animation paper. Note the timing charts to do the in-between drawings.
These are 4 Key Poses of Skippy from Animaniacs doing a "Take". The first is a starting pose.
Skippy Anticipates down
and pops up to an Extreme Take
and then settles down into final pose
Note: This Key drawings requires you to create a Clean up drawing of the head with no Eyes. A separate series of drawings can be created for a blink; Open eyes as E1, Half lids E2 and Closed lids E3.
From John from Peter Pan, used at CalArts.
Draw the Passing Position.
Try inbetweening Merlin stepping in
Here's a big guy lifting something heavy.
A5 is the anticipation.
Then the lift up.
A11 is the settle.
This was from one of the first animation job where I was an assistant animator and got to inbetween and cleanup this Disney character called Figment. I learned a lot about inbetweening from my mentor Jon McClenahan, who animated this character for a Disney educational series before opening his own animation studio called "StarToons".
Here was my solution to a body turn at the time during dialog.