Examples:

• Please speak English to the ambassador's secretary.
• Please speak English, John.
• Please speak English with me. I want to practice my pronunciation.
• This is an English class, boys. Please speak English.
• Can we please speak English at the table?
• Look, can you please speak English?
• Could you please speak English right now? Hey, look.
• Doctor, please speak English. My mother doesn't understand Spanish.