釋義：

have to+動(dòng)詞不得不做某事

表示“不得不做某事”，強(qiáng)調(diào)動(dòng)詞的“強(qiáng)行”成分。雖然不是助詞，但經(jīng)常會(huì)被當(dāng)成助詞來(lái)用，過(guò)去式為 had to,將來(lái)時(shí)為 will have to。

例句：

I'm sorry, but I have to cancel my reservation.
對(duì)不起，我不得不取消晚上的預(yù)約了。
I have to go now.
我現(xiàn)在必須得走了。
I have ( got ) to go. I'll call you later.
我必須得走了，回頭見。
I have to tell you ( something ) . I love being alone.
我得告訴你點(diǎn)事情。我喜歡獨(dú)處。
Act your age. You have to grow up.
能不能成熟點(diǎn)。你得學(xué)會(huì)長(zhǎng)大了。
Do I have to make a reservation?
我必須要預(yù)約嗎？
Do I have to wait here until she gets in?
我必須要在這等她回來(lái)嗎？
It's totally my fault. You don't have to say you're sorry.
都是我的錯(cuò)，你不用說(shuō)對(duì)不起。

對(duì)話：

A: You don't have to say you're sorry.
你不必說(shuō)對(duì)不起。
B: Sure I do. It was all my fault.
必須的，都是我的錯(cuò)。
A: I have to leave right away for the meeting.
我得馬上去開會(huì)了。
B: I'll catch up with you later.
我回頭聯(lián)系你。
A: I'd be pleased if you could join us for dinner.
如果你能和我們共進(jìn)晚餐就太好了。
B: I'll have to call my wife first.
我得先給老婆打電話。