Ihavetoworkonsunday.
我星期天得上班。
A:Canwemeetforlunchonsunday?
A:星期天我们能一起吃午饭吗？
B:No,I'msorry.Ican't.Ihavetoworkonsunday.
B:对不起，不行。我星期天得上班。
A:Oh,that'sapity.Iforgotyousometimesworkatweekends.
A:哦，太遗憾了。我忘了你有时周末加班。
B:Wecouldgoforlunchonsaturday,ifyou'dlike.
B:周六我们可以一起吃午饭，如果你愿意的话。
A:Yes,that'dbegood.Let'sdosaturdayitead.
A:好，可以。那我们就改在周六了。
Notes注释
1.WhensomeoneasksyouaquestionbegiingCanyou..?/Canyou..?,thesimplereoeisusuallyYes,Ican/Yes,IcanorNo,Ican't/No,Ican't.
当有人问你以Canyou..?/你能..吗?开头的问题时，简单的回答是Yes,Ican/是的，我可以。或者No,Ican't/不，我不行。
2.Remembervariousphrasestodescribetimes,egattheweekend/attheweekend:anotherday/anotherday:duringtheweek/duringtheweek:ontuesdays/ontuesdays.
记住用不同的短语来描述不同的时间段。例如attheweekend/在周末；anotherday/另一天：duringtheweek/在这周内:onTuesdays/在周二。
3.Ifyouaretalkingaboutapoibility,youcanusecould/could,egWecouldgoforlunch/Wecouldgoforlunch:Itcouldraintomorrow/Itcouldraintomorrow.
如果你在谈论某种可能性，你可以用could/可能。例如Wecouldgoforlunch/我们可以一起吃午饭。Itcouldraintomorrow/明天可能会下雨。