Translation:Do not speak English.
I found this in the "Health" lesson... Is speaking English bad for your health?
'Stop speaking English' presupposes that the person you are addressing has spoken English, while 'don't speak English' can be said as a warning before they got a word out of their mouths...
Duolingo use plummets!
I translated this as "I don't speak English" since I assumed that the speaker was talking to me and the "I" was understood. That came back as wrong. The correct answer given by duolingo is "Don't speak English" which I feel is an unnatural translation for an English speaker unless they were deliberately being as literal with their translations as possible
不會講英文 bù huì jiǎng yīngwén
would be understood as (I) don't speak English.
別說英語 bié shuō yīngyǔ
is clearly a command or instruction said to others