问人用英语应该怎么说

To ask someone in English, you can use the phrase "Can I ask you a question?" or "Do you have a moment to talk?" You can also use a more casual phrase like "What's up?" or "What's going on?" if the person you're talking to is someone you're familiar with.
You could also say “Excuse me, could I ask you something?” “Excuse me, could you help me with something?”