The infinitive is IR. The yo form is voy. Taking away the “o” doesn’t work. So this verb is irregular. You can still get the opposite ending. No te vayas. Don’t yourself go.
The infinitive is preocupar. The yo form, preocupo. The opposite ending for ustedes, en. No se preocupen. Don’t yourselves worry.
The infinitive is romper. The yo form, rompo. The opposite ending for tú, as. No rompas. Don’t break.
The infinitive is hablar. The yo form, hablo. The opposite ending for tú, es. No hables. Don’t talk.
