情景导入
周六是你的生日，你想邀请同学来家里开派对。递出邀请卡时该怎么说？
Can you come to my party on Saturday afternoon?（周六下午你能来我的派对吗？）
同学的回答可能有两种：Sure, I'd love to!（当然，我很乐意！）或者 I'm sorry, I can't. I have to study for a math test.（抱歉来不了，我得备考数学。）接受要热情，拒绝要给出理由——这是英语交际的礼貌法则。本单元我们学习邀请与回复的各种表达，还有"不得不"的 have to。
核心词汇
| 单词/短语 | 词性 | 意思 | 例句 |
|---|---|---|---|
| invite | v. | 邀请 | Thanks for inviting me. |
| invitation | n. | 邀请；请柬 | Did you get the invitation? |
| hang out | 短语 | 闲逛 | Let's hang out this weekend. |
| accept | v. | 接受 | She accepted my invitation. |
| look forward to | 短语 | 期待 | I'm looking forward to your reply. |
句型与语法
语法点一：发出邀请的三种句型
- Can you come to my party? （最常用）
- Would you like to come to my party? （更客气）
语法点二：接受与婉拒
| 场景 | 表达 |
|---|---|
| 接受 | Sure, I'd love to. / Yes, I'd be happy to come. |
| 婉拒 | I'm sorry, I can't. I have to help my parents. |
婉拒公式：道歉 + 理由。只说 No 会显得非常不礼貌。
语法点三：have to 与情态动词 must
- have to：因客观情况不得不——I have to catch the last bus.（末班车要开了。）
- must：主观认为必须——I must finish my homework first.（我自己觉得必须。）
- have to 有人称和时态变化：has to（三单）、had to（过去式）；must 没有变化，否定式 mustn't 表"禁止"。
听说训练
邀请三连（两人一组，练习邀请、接受与婉拒）：
- Can you come to my birthday party on Saturday? — Sure, I'd love to! What time?
- Would you like to visit the Hangzhou Grand Canal Museum with me? — I'd love to, but I have to look after my little sister.
跟读要点：I'd love to 中的 'd 别丢，丢了意思会变成"我爱"；sorry 的语调下沉，听起来才诚恳。
辨析对比
① have to vs must
- have to 强调客观："店要关门了"——We have to leave now.
- must 强调主观："我觉得必须"——I must study harder.
- 过去时只能用 had to：Yesterday I had to stay at home.
② don't have to vs mustn't
- don't have to = needn't，"不必"：You don't have to bring a gift.（可带可不带。）
- mustn't 是"禁止"：You mustn't play with fire.（绝对不行！）
文化角
英文请柬上常见四个大写字母 RSVP，来自法语，意思是"请回复"（Reply, please）。收到写有 RSVP 的邀请，无论去不去都要尽快回复，这是西方社交的基本礼仪。回复婉拒时，西方人习惯"遗憾 + 理由 + 祝福"三步走：Sorry I can't make it. I have a piano lesson. Have a great party! 学会这一套，你的英文社交就很得体了。
易错点
- 三单漏变 has to：He have to do his homework. ❌ → He has to do his homework. ✅
- look forward to 接原形：look forward to see you ❌ → look forward to seeing you ✅（这里 to 是介词）
- 回答邀请太生硬：— Can you come? — No. ❌ → I'm sorry, I can't. I have to... ✅（要道歉并给理由）
中考真题
— Can you go to the concert with me at Hangzhou Grand Theatre tonight?
— I'd love to, but I ______ look after my grandmother. She isn't feeling well.
A. can B. may C. have to D. could
✏️ 点击查看解答
答案：C
解析：本题考查情态动词与 have to 的用法。答语先接受心意（I'd love to），再用 but 转折说明客观原因——要照顾生病的奶奶，表示"不得不"，用 have to，故选 C。
"I'd love to, but I have to..." 是中考补全对话中婉拒邀请的黄金句式。
考点
- 邀请与应答是中考补全对话题的高频场景：Can you...? / Would you like to...? 与 I'd love to, but... 要成套掌握；
- have to 与 must、don't have to 与 mustn't 的辨析是单选常客，判断关键是"客观还是主观""不必还是禁止"。
诵读 Read Aloud
Dear Emma,
Next Saturday, June 20th, is my fourteenth birthday, and I'm going to have a party at my home near West Lake. Can you come? The party will start at 3:00 p.m. We are going to play games, sing songs and enjoy a big birthday cake. My mom will also cook some traditional Hangzhou dishes—you must try the sweet and sour fish! After the party, we can hang out by the lake and watch the musical fountain. If you can't come, please let me know by Thursday, because I have to prepare enough food and drinks. I'm looking forward to your reply!
Yours, Li Hua
诵读小贴士：这是一封标准的英文邀请函——开头点明活动与时间，中间介绍安排，结尾请对方回复；背下这个框架，把活动内容换一换，就是你自己的满分邀请函。