"mach" is the imperative form of "machen" and perfectly fine in that sentence in the sense of "Honecker, please turn of the lights!". With "macht" the sentence would be more of an observation and the "bitte" (please)…
"mach" is the imperative form of "machen" and perfectly fine in that sentence in the sense of "Honecker, please turn of the lights!". With "macht" the sentence would be more of an observation and the "bitte" (please)…