Learn Romanian: Mergi repede afară!

For many 3rd conjugation verbs (verbs ending in -e), the singular command form looks like the "he/she" present tense form (for example, a crede becomes Crede!). However, a merge is an important exception. Its singular command is Mergi!, which matches the "you" present tense form (tu mergi). Another common verb that does this is a trece (Treci!).

How would I make this a negative command, like "Don't go outside!"?

You would say Nu merge afară!. Remember that for negative singular commands, Romanian uses nu plus the dictionary form (the infinitive) of the verb (a merge), not the affirmative command form. It is a common mistake to try and say Nu mergi!, so watch out for that!

Does the word repede change if I'm talking to more than one person?

No, repede means "quickly" or "fast" here, acting as an adverb to describe the verb. Adverbs never change form in Romanian regardless of who you are talking to or how many people there are. If you told a group to go quickly, only the verb would change: Mergeți repede afară!.

Could I change the word order to Mergi afară repede!?

Yes, that is grammatically correct and perfectly understood. However, putting the adverb repede right after the verb is very natural in Romanian and strongly emphasizes the speed of the action, similar to saying "Go quickly outside!".