have to

必须；只好，势必，不得不（后跟动词原形）

If we have to litigate, we will.(如果我们必须提起诉讼的话，我们会的。)

He's useless—he'll have to go.(他毫无用处—得辞掉他。)

You'll have to travel in disguise.(你将不得不乔装出行。)

Sorry, I really have to bail.(对不起，我真得赶紧走了。)

Hotel inspectors have to travel incognito.(酒店检查员巡查时必须隐瞒真实身份。)

I have to stay in on weeknights.(除了星期六和星期日外我每天晚上都得待在家里。)

I have to make a phone call.(我得打个电话。)

They may have to amputate.(他们可能不得不施行截肢手术。)

I'll have to leave after this hand.(这一盘打完后我必须走了。)

I have to finish this essay today. We have to hand them in tomorrow.(我今天得完成这篇论文，因为我们明天必须交。)

1. 要：我已经快要(soon)饿死了ㄟ. 我还要(have to)等多久?!我:我们要(Going to)去吃饭,你要不要(want)一起去?你:我要(want)去,我要(want)去!让我先把这个做完.....我:嘿,我已经快要(soon)饿死了ㄟ. 我还要(have to)等多久?!

2. 不得不;必须：have to do with 与...有关;和...打交道 | have to 不得不;必须 | have trouble with 同...闹纠纷