In informal settings, people are normally on a first-name basis. Sometimes older folks even allow young people to call them by their first name. But in most formal situations, people use an appropriate title-such as Mr. (Mister), Ms. ("Miz"), Dr. (doctor) or Prof. (professor)-with a person's last name. After an introduction, the person may say, for example, "

lease call me Tom." If not, use his or her surname.
在非正式的情况下,人们一般会以名字相称,有时候长辈甚至允许年轻人喊他们的名字。不过大部份的正式场合里,人们会采用适当的称谓。例如:先生、女士、博士、教授再加上姓来称呼人。经过介绍之后,对方可能会说:「请叫我Tom就好了。」否则,还是以他的姓称呼之。