欢迎嘉宾

"Welcome guests, please make yourselves at home."

邀请嘉宾并确认参加

"We look forward to seeing you on [date]."

"Just call our office at [phone number] and we will be glad to secure a place for you."

正式邀请函

"Dear sir/madam,"

"On [date], we will host [event/activity] and we would be honored to have you as our guest."

介绍嘉宾

"Ladies and gentlemen, it is my great pleasure to introduce our guest speaker for today's event, [guest's name]."

"[Guest's name] is a renowned expert in [field of expertise] and has contributed significantly to [industry/field]."

嘉宾发言

"Thank you for having me here today. I am excited to share my insights and experiences on [topic]."

"[Guest's name] will be discussing [specific topic] and we believe his expertise will be invaluable to all of us."

希望这些示例能帮助你撰写出合适的嘉宾介绍英语作文。根据具体情况，你可以调整措辞和内容，以确保介绍既正式又得体。