1
have to + base verb
表示客观要求或义务。
I have to finish my homework.
我必须完成作业。
必须；不得不
先理解核心含义，再看它在真实句子里的用法。
必须；不得不
To be obliged or required to do something; must
I have to finish my homework.
我必须完成作业。
必须；需要；表示义务。
Must; need to; to be urged to; to be required to; indicates obligation.
一定；必定；表示逻辑推断。
Must; expresses a logical conclusion.
have to
Base
原形
has to
3rd person
第三人称单数
having to
-ing
现在分词
had to
Past
过去式
had to
Past participle
过去分词
I have to finish my homework.
我不得不完成作业。
She had to leave early.
她不得不早走。
We are having to work overtime this week.
这周我们不得不加班。
注意：'have to' 后接动词原形，否定式用 don't/doesn't/didn't have to 表示‘不必’。
I have to finish my homework before I can play video games.
我必须在玩电子游戏之前完成作业。
She has to wear a uniform at her new school.
她在新学校必须穿校服。
We had to wait for over an hour because the train was delayed.
因为火车晚点，我们不得不等了一个多小时。
表示客观要求或义务。
I have to finish my homework.
我必须完成作业。
表示不必要，而非禁止。
You don't have to come if you're busy.
如果你忙，你不必来。
后接名词或形容词，表示必须处于某种状态。
She has to be at work by 8 a.m.
她必须在早上8点前到单位。
Not this
I have go now.
Use this
I have to go now.
中文学习者容易遗漏 "to"，因为汉语中“必须”后直接跟动词，而英语中 "have" 后必须接 "to" 再加动词原形表示义务。
Not this
I must go yesterday.
Use this
I had to go yesterday.
表达过去的义务时，"must" 没有过去式形式，应改用 "had to"。
Not this
I should finish my homework.
Use this
I have to finish my homework.
"should" 表示建议或主观责任，而 "have to" 表示外部规则或强制要求，如老师布置的作业应使用 "have to" 来强调客观义务。
Choose the next layer that will help you use have to with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use have to naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.