should
vb the past tense of shall: used as an auxiliary verb to indicate that an action is considered by the speaker to be obligatory (you should go) or to form the subjunctive mood with I or we (I should like to see you; if I should be late, go without me)
(Old English sceold; see shall)
Should has, as its most common meaning in modern English, the sense ought as in I should go to the graduation, but I don't see how I can. However, the older sense of the subjunctive of shall is often used with I or we to indicate a more polite form than would: I should like to go, but I can't. In much speech and writing, should has been replaced by would in contexts of this kind, but it remains in formal English when a conditional subjunctive is used: should he choose to remain, he would be granted asylum
Dictionnaire anglais Collins English definition-Thesaurus  

Pour ajouter des entrées à votre liste de vocabulaire, vous devez rejoindre la communauté Reverso.
C’est simple et rapide:
- Créez votre liste de vocabulaire
- Participez au Dictionnaire Collaboratif
- Mettez en valeur vos connaissances linguistiques
"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"