The English modal verbs consist of the core modals "can", "could", "may", "might", "must", "shall", "should", "will", "would", as well as "ought (to"), "had better", and in some uses "dare" and "need". These do not inflect for person or number, do not occur alone, and do not have infinitive or participle forms (except synonyms, as with "be/being/been able (to") for the modals "can/could"). The modals are used with the basic infinitive form of a verb ("I can swim, he may be killed", "we dare not move", "need they go?"), except for "ought", which takes "to" ("you ought to go"). Modals can indicate the condition, probability, possibility, necessity, obligation and ability exposed by the speaker's or writer's attitude or expression.