How do I understand the Tú commands and Usted, Ustedes Commands?
I am having trouble understanding how to know when to change verbs when using Tú commands and Ud. and Uds. commands. And this is mainly with irregular verbs. Like Ser, Ir, Irse, etc. Especially when I need write No desvestirse like ¡No te desvistas! Instead of being able to write, ¡No desvistaste! Also, if it isn´t a negative and you have Acostarse, and it´s written like this ¡Acuséstate!, can it also be written like this, ¡Te Acuésta! Hope this all made some sense.
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Would you like to pracise with my flashcard set?
There is a Reference Article that may shed some light on your problems. You will find the Reference Article if you "click" on this link ----> About the Imperative.
The link is a springboard to four other individual pages. Collectively, they will help you through your questions better than anything I could say.
After you have read them, please feel free to open a new question thread and ask anything you want. If the articles don't do anything else, they might help you to ask questions from a better base of understanding and knowledge.
Good luck with all of this.