Answer:
I am going to assume you mean the "informal" command. These are tú commands. You would use these commands with friends, family, and informal peers (classmates, for example).
I added a table with columns for affirmative (do it) and negative (don't do it) commands.
Affirmative tú commands are formed by using the third person singular form of the conjugated regular verb. There are only eight irregular verb--see table.
Negative tú commands are formed by doing the following steps:
- See table for irregular verbs -- They're color coded
- For regular negative tú commands verbs, put the regular verb into the yo form, (i.e. hablo, como, escribo) [This captures stem changing verbs and other spelling changes
- Remove the -o/-oy (i.e. habl, com, escrib)
- Add "No" before the verb and add the "opposite" ending (i.e. hables, comas, escribas)
Step-by-step explanation:
The above briefly explains how to form informal commands.