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Behove is a verb, mostly British. Americans usually write behoove. You do not say I behove to leave. You say it behoves someone to do something — it is right, or wise, or needed that they do it. It behoves us to check the facts means we really should check, and we would be foolish or unfair not to. It is formal and a bit old. Teachers, judges, and newspapers still use it; friends almost never do. The subject is usually it, standing for the situation, not a person ‘doing’ the verb. Though actually, the old meaning was closer to need than to moral duty — you needed this, so it ‘behoved’ you — and a faint sense of ‘this will help you’ is still in the word.
應當、理應（多為英式拼法；美式作 behoove）
組成From Middle English behoven / bihoven, ‘to be needed or required’, from Old English behōfian, ‘to need’. Scholars trace it further to a Germanic verb, and ultimately to a very old root meaning ‘to grab, seize’. Dutch behoeven, Danish behøve and Swedish behöva still mean ‘to need’.
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
behoveverb/bɪˈhəʊv/
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formalTo befit, to suit.
- [W]here therefore public diversions are tolerated, it behoves persons of distinction, with their power and example, to preside over them in such a manner as to check any thing that tends to the corruption of manners, or which is too mean or trivial for the entertainment of reasonable creatures.
- It behoves every man, who values liberty of conscience for himself, to resist invasions of it in the case of others; it behoves him too, in his own case, to give no example of concession, betraying the common right of independent opinion, by answering questions of faith, which laws have left between God and himself.
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formalTo be necessary for (someone).
- Accordingly, Mr. Stryver inaugurated the Long Vacation with a formal proposal to take Miss Manette to Vauxhall Gardens; that failing, to Ranelagh; that unaccountably failing too, it behoved him to present himself in Soho, and there declare his noble mind.
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formalTo be in the best interest of; to benefit.
- Seeing by the late alliance termed the Rhenish Confederacy, that Louis, King of France, has the most cunning and diabolic intentions on the Imperial Crown, thereby behoving all Germans to unite in a band of brotherhood.
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formalTo be needful, meet or becoming.
- It behooved that the Sonne of God suld descend unto us, and tak himselfe a bodie of our bodie, flesh of our flesh, and bone of our bones, and so become the Mediator betwixt God and man, giving power to so many as beleeve in him, to be the sonnes of God; […]
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。