We use the polite informal when talking with peers; most ordinary conversation will take place in the polite informal.
Now relax and take a deep breath. To figure out the correct endings for a polite informal verb, we’re going to need to make quite a few decisions. At first this is going to take a long time to figure out how to say a verb while you work through the steps. After practice, it will be almost automatic (trust me—it really will be).
Look at the stem of the verb.
Look at the last vowel of the stem.
|(to be good)||+|
In all other cases:
Take another deep breath, and congratulate yourself for having made it through this page, which is probably the most complicated one in the whole tutorial!