English (the English language)

in English

I don't speak English

(informal) Do you know English? (It's used instead of "Do you speak ...").

(formal, or to a group of people) Do you know English? (It's used instead of "Do you speak ...").

(informal) Can you speak English? (It's used instead of "Do you speak ...").

Can you speak English? (It’s used instead of “Do you speak ...”).

to English / to translate into English

British English

American English