"You didn't plug in the computer; plug it in!"

Translation: Tu n'as pas branché l'ordinateur, branche-le !

[Jenny409129]

Why is it 'branche-le' not 'branches-le' or 'branchez-le'?

[auyuittuq]

Branches-le isn't acceptable because its conjugation doesn't work here (2nd person singular imperative is -e, not -es). You could use branchez-le though if you use 'vous' for the first part (as the second part would also have to be plural)

[--Roody--]

To be thorough... The "s" is dropped from the tu form of the imperatif with only the "first group" of verbs. That is, regular verbs that end in -er plus the irregular verb aller. All other verbs retain the "s".

[Chris168181]

i did Vous n'avez pas branché l'ordinateur; branche le! and it was not correct

[Ripcurlgirl]

Vous n'avez pas branché l'ordinateur, branchez-le !