3-21. try, tries, to try, trying, tried.
[You try to do X.] = Because you want X to happen, you do things that you think can cause X to happen.
[I tried to do something good.]
3-22. change, changes, to change, changing, changed.
[X changed.] = Something happened to X. Because of this, X is not the same as before.
[After this kind of animal is alive for some time, its body changes.]
[J changed K.] = J caused K to change.
[When these people did something bad, it changed what I thought about them.]
3-23. surface, surfaces, surface of, surfaces of, on the surface.
[You see the surface of X.] = You see part of X. This part is where other things can touch X.
[I can see the surface of this thing, but I cannot see what is inside.]
[When I touched this thing, I could feel parts of it moving below its surface.]
[J is on the surface of K.] = J is touching the surface of K.
Tony wants to know what is inside this container.
Tony tries __________.