几点了用英语怎么说

It depends on the context. If you are asking someone the time in English, you could say "What time is it?" or "Can you tell me the time, please?" If you want to state the time, you could say "It is [time]" or "[time] o'clock". For example, if it is currently 3:45, you could say "It is three forty-five" or "It is a quarter to four".