2.Welcometomyclassandthankyouforjoiningourpubliclecture.
3.Ihopeyouallenjoyyourtimehereandfindthislectureenlightening.
1.It'smypleasuretobeheretoday.Mynameis[yourname],andI'm[yourposition/rank]in[department/school].
2.I'mdelightedtosharewithyoumyexpertisein[topic/area]today.
1.Today,wewillbediscussing[topic].I'vedividedthelectureintothreepartstomakeiteasierforyoutofollowalong.
2.We'llbecoveringawiderangeoftopics,including[listoftopics].Pleasefeelfreetoaskquestionsatanytimeduringthelecture.
1.Ifyouhaveanyquestionsorcomments,pleasefeelfreetoraisethemnoworduringmypresentation.
2.I'dliketoinviteeveryonetoparticipateinabriefdiscussionaftermylecture.Pleasefeelfreetoshareyourthoughtsandfeedback.
1.Let'smoveonto[topic].I'llbeexplainingitindetailtoday.
2.I'llnowshowyouashortvideocliptoillustrate[topic].Pleasepaycloseattention,andifyouhaveanyquestions,feelfreetoaskduringtheQ&Asession.
1.Aftermypresentation,I'lltakesometimetoansweryourquestions.PleaseraiseyourhandandI'llcallonyouindividually.
2.Ifyouhaveaquestionthatyouwanttoaskme,pleaseremembertowriteitdownbeforehandsothatwecankeepthediscussionorganized.
1.Thankyouallforjoiningustoday.Ihopeyoufoundthelectureinformativeanduseful.
2.Pleasefeelfreetocontactmeifyouhaveanyfurtherquestionsorcommentsregarding[topic/area].
3.Wehopetoseeyouagainnexttime!Goodbye,everyone.
1.Pleaseremainquietandpayattentionduringthelecture.Anydisruptivebehaviorwillnotbetolerated.
2.Ifyouneedtousetherestroom,pleaseinformmeoroneoftheassistants,andwe'llmakesuretoaccommodateyouasquicklyaspossible.
3.Pleaserespecttheclassroomsandotherstudentsbykeepingyourvoicesdownafterthelecturehasended.
1.Ifyouhaveanyquestionsorconcerns,pleasefeelfreetoaskmeoroneofyourclassmatesforhelp.We'reheretosupportyou.
2.Whenyouparticipateactivelyinthediscussionorcompleteataskwell,pleaseletmeknowsothatIcanrecognizeyoureffortspublicly.Positivereinforcementgoesalongway!
以上就是公开课全英文授课必备口语的一些常用表达和场景，希望能对您的课堂教学有所帮助，记得在授课过程中保持自信和热情，与学生建立良好的互动关系，让他们感受到您的专业和关爱。