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Sam: Hey, Ben, it’s Sam. What are you up to today? Would you like to come to a gym class?
Ben: Hi, Sam. Sure, I don’t have any plans. What time does it start?
Sam: At 2:00. It’s at the High Reps Gym in Pudong.
Ben: Ok, but do I need to pay for the class?
Sam: No, it’s free today. They are giving free classes to help people improve their health!
Ben: That’s great! See you there just before 2:00.
With question tags, intonation rises when the person asking the question is not sure of the answer, for example when asking a question with a yes/no answer.
accident:“事故”，通常指不愉快的、意外的不测之事，常导致不良后果
event:既可指历史上的重大事件，国际上的、国内的重大事件，也可指日常事件，还可表示体育活动的比赛项目
incident:指与某人或某些重要事件有关的、不太重要的事情或叙述中的一件事，有时指引起战争、争端的突发事件
He acted as host to visitors.他以主人身份接待来客。
Who will be the host for tonight's program?谁是今晚的节目主持人?
